438618690 has 48 divisors (see below), whose sum is σ = 1177203456. Its totient is φ = 113191200.

The previous prime is 438618679. The next prime is 438618737. The reversal of 438618690 is 96816834.

438618690 is a `hidden beast` number, since 4 + 386 + 186 + 90 = 666.

It is a super-2 number, since 2×438618690² = 384772710434632200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 75816 + ... + 81395.

It is an arithmetic number, because the mean of its divisors is an integer number (24525072).

Almost surely, 2^438618690 is an apocalyptic number.

438618690 is an abundant number, since it is smaller than the sum of its proper divisors (738584766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

438618690 is a wasteful number, since it uses less digits than its factorization.

438618690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157255 (or 157252 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 438618690 is about 20943.2253962946. The cubic root of 438618690 is about 759.7937401953.

The spelling of 438618690 in words is "four hundred thirty-eight million, six hundred eighteen thousand, six hundred ninety".