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1397121 = 31142337

1397121 has 8 divisors (see below), whose sum is σ = 2032224. Its totient is φ = 846720.

The previous prime is 1397119. The next prime is 1397131. The reversal of 1397121 is 1217931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1397121 - 21 = 1397119 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1397091 and 1397100.

It is not an unprimeable number, because it can be changed into a prime (1397101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21136 + ... + 21201.

It is an arithmetic number, because the mean of its divisors is an integer number (254028).

21397121 is an apocalyptic number.

1397121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1397121 is a deficient number, since it is larger than the sum of its proper divisors (635103).

1397121 is a wasteful number, since it uses less digits than its factorization.

1397121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42351.

The product of its digits is 378, while the sum is 24.

The square root of 1397121 is about 1181.9987309638. The cubic root of 1397121 is about 111.7921581199.

It can be divided in two parts, 139 and 7121, that added together give a triangular number (7260 = T120).

The spelling of 1397121 in words is "one million, three hundred ninety-seven thousand, one hundred twenty-one".

Divisors: 1 3 11 33 42337 127011 465707 1397121