387400636 has 24 divisors (see below), whose sum is σ = 793701216. Its totient is φ = 161978880.

The previous prime is 387400621. The next prime is 387400639. The reversal of 387400636 is 636004783.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 387400595 and 387400604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387400639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167581 + ... + 169876.

It is an arithmetic number, because the mean of its divisors is an integer number (33070884).

Almost surely, 2^387400636 is an apocalyptic number.

It is an amenable number.

387400636 is an abundant number, since it is smaller than the sum of its proper divisors (406300580).

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

387400636 is a wasteful number, since it uses less digits than its factorization.

387400636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337509 (or 337507 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 387400636 is about 19682.4956750916. The cubic root of 387400636 is about 728.9875474799.

The spelling of 387400636 in words is "three hundred eighty-seven million, four hundred thousand, six hundred thirty-six".