403638945 has 16 divisors (see below), whose sum is σ = 679813440. Its totient is φ = 203943744.

The previous prime is 403638931. The next prime is 403638959. The reversal of 403638945 is 549836304.

It is an interprime number because it is at equal distance from previous prime (403638931) and next prime (403638959).

It is not a de Polignac number, because 403638945 - 2⁵ = 403638913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 403638897 and 403638906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707854 + ... + 708423.

It is an arithmetic number, because the mean of its divisors is an integer number (42488340).

Almost surely, 2^403638945 is an apocalyptic number.

It is an amenable number.

403638945 is a deficient number, since it is larger than the sum of its proper divisors (276174495).

403638945 is a wasteful number, since it uses less digits than its factorization.

403638945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416304.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 403638945 is about 20090.7676558164. The cubic root of 403638945 is about 739.0338895921.

The spelling of 403638945 in words is "four hundred three million, six hundred thirty-eight thousand, nine hundred forty-five".