623657449 has 4 divisors (see below), whose sum is σ = 625959040. Its totient is φ = 621355860.

The previous prime is 623657399. The next prime is 623657477. The reversal of 623657449 is 944756326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 623657449 - 2¹⁵ = 623624681 is a prime.

It is a super-2 number, since 2×623657449² = 777897227386375202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 623657399 and 623657408.

It is not an unprimeable number, because it can be changed into a prime (623657479) 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, 1150389 + ... + 1150930.

It is an arithmetic number, because the mean of its divisors is an integer number (156489760).

Almost surely, 2^623657449 is an apocalyptic number.

It is an amenable number.

623657449 is a deficient number, since it is larger than the sum of its proper divisors (2301591).

623657449 is a wasteful number, since it uses less digits than its factorization.

623657449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301590.

The product of its digits is 1088640, while the sum is 46.

The square root of 623657449 is about 24973.1345449465. The cubic root of 623657449 is about 854.3753398219.

The spelling of 623657449 in words is "six hundred twenty-three million, six hundred fifty-seven thousand, four hundred forty-nine".