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1372161 = 37192181
BaseRepresentation
bin101001111000000000001
32120201020210
411033000001
5322402121
645224333
714443320
oct5170001
92521223
101372161
11857a1a
125620a9
1339073b
1427a0b7
151c1876
hex14f001

1372161 has 24 divisors (see below), whose sum is σ = 2218944. Its totient is φ = 738720.

The previous prime is 1372139. The next prime is 1372171. The reversal of 1372161 is 1612731.

1372161 = T21 + T22 + ... + T201.

It is not a de Polignac number, because 1372161 - 26 = 1372097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1372171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7491 + ... + 7671.

It is an arithmetic number, because the mean of its divisors is an integer number (92456).

It is a Proth number, since it is equal to 335 ⋅ 212 + 1 and 335 < 212.

21372161 is an apocalyptic number.

It is an amenable number.

1372161 is a deficient number, since it is larger than the sum of its proper divisors (846783).

1372161 is a wasteful number, since it uses less digits than its factorization.

1372161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 210 counting only the distinct ones).

The product of its digits is 252, while the sum is 21.

The square root of 1372161 is about 1171.3927607767. The cubic root of 1372161 is about 111.1224199230.

1372161 divided by its sum of digits (21) gives a triangular number (65341 = T361).

Adding to 1372161 its reverse (1612731), we get a palindrome (2984892).

The spelling of 1372161 in words is "one million, three hundred seventy-two thousand, one hundred sixty-one".

Divisors: 1 3 7 19 21 57 133 181 361 399 543 1083 1267 2527 3439 3801 7581 10317 24073 65341 72219 196023 457387 1372161