387990522 has 12 divisors (see below), whose sum is σ = 840646170. Its totient is φ = 129330168.

The previous prime is 387990521. The next prime is 387990539. The reversal of 387990522 is 225099783.

387990522 is a `hidden beast` number, since 38 + 7 + 9 + 90 + 522 = 666.

It can be written as a sum of positive squares in only one way, i.e., 385297641 + 2692881 = 19629^2 + 1641^2 .

It is not an unprimeable number, because it can be changed into a prime (387990521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10777497 + ... + 10777532.

Almost surely, 2^387990522 is an apocalyptic number.

387990522 is an abundant number, since it is smaller than the sum of its proper divisors (452655648).

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

387990522 is a wasteful number, since it uses less digits than its factorization.

387990522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21555037 (or 21555034 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 387990522 is about 19697.4750158491. The cubic root of 387990522 is about 729.3573640064.

The spelling of 387990522 in words is "three hundred eighty-seven million, nine hundred ninety thousand, five hundred twenty-two".