438640632 has 96 divisors (see below), whose sum is σ = 1226862000. Its totient is φ = 141488640.

The previous prime is 438640603. The next prime is 438640651. The reversal of 438640632 is 236046834.

It is a happy number.

438640632 is a `hidden beast` number, since 4 + 3 + 8 + 640 + 6 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 409794 + ... + 410862.

Almost surely, 2^438640632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 438640632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (613431000).

438640632 is an abundant number, since it is smaller than the sum of its proper divisors (788221368).

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

438640632 is a wasteful number, since it uses less digits than its factorization.

438640632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 438640632 is about 20943.7492345568. The cubic root of 438640632 is about 759.8064096025.

The spelling of 438640632 in words is "four hundred thirty-eight million, six hundred forty thousand, six hundred thirty-two".