623456437 has 4 divisors (see below), whose sum is σ = 635219820. Its totient is φ = 611693056.

The previous prime is 623456399. The next prime is 623456447. The reversal of 623456437 is 734654326.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 447787921 + 175668516 = 21161^2 + 13254^2 .

It is a cyclic number.

It is not a de Polignac number, because 623456437 - 2²⁷ = 489238709 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 623456437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623456447) 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 3 ways as a sum of consecutive naturals, for example, 5881612 + ... + 5881717.

It is an arithmetic number, because the mean of its divisors is an integer number (158804955).

Almost surely, 2^623456437 is an apocalyptic number.

It is an amenable number.

623456437 is a deficient number, since it is larger than the sum of its proper divisors (11763383).

623456437 is a wasteful number, since it uses less digits than its factorization.

623456437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11763382.

The product of its digits is 362880, while the sum is 40.

The square root of 623456437 is about 24969.1096557326. The cubic root of 623456437 is about 854.2835382778.

The spelling of 623456437 in words is "six hundred twenty-three million, four hundred fifty-six thousand, four hundred thirty-seven".