1373643 has 24 divisors (see below), whose sum is σ = 2168400. Its totient is φ = 834624.

The previous prime is 1373639. The next prime is 1373677. The reversal of 1373643 is 3463731.

It is a happy number.

1373643 is a `hidden beast` number, since 13 + 7 + 3 + 643 = 666.

It is not a de Polignac number, because 1373643 - 2² = 1373639 is a prime.

It is a d-powerful number, because it can be written as 1 + 3⁴ + 7⁷ + 3⁷ + 6 + 4⁷ + 3¹² .

It is not an unprimeable number, because it can be changed into a prime (1373683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4821 + ... + 5097.

It is an arithmetic number, because the mean of its divisors is an integer number (90350).

2^1373643 is an apocalyptic number.

1373643 is a deficient number, since it is larger than the sum of its proper divisors (794757).

1373643 is a wasteful number, since it uses less digits than its factorization.

1373643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 328 counting only the distinct ones).

The product of its digits is 4536, while the sum is 27.

The square root of 1373643 is about 1172.0251703782. The cubic root of 1373643 is about 111.1624113850.

It can be divided in two parts, 1373 and 643, that added together give a triangular number (2016 = T₆₃).

The spelling of 1373643 in words is "one million, three hundred seventy-three thousand, six hundred forty-three".