387921375 has 24 divisors (see below), whose sum is σ = 699294960. Its totient is φ = 206890800.

The previous prime is 387921349. The next prime is 387921379. The reversal of 387921375 is 573129783.

It is a happy number.

It is not a de Polignac number, because 387921375 - 2²⁰ = 386872799 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 387921375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387921379) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171285 + ... + 173534.

It is an arithmetic number, because the mean of its divisors is an integer number (29137290).

Almost surely, 2^387921375 is an apocalyptic number.

387921375 is a deficient number, since it is larger than the sum of its proper divisors (311373585).

387921375 is a wasteful number, since it uses less digits than its factorization.

387921375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344840 (or 344827 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 387921375 is about 19695.7197126685. The cubic root of 387921375 is about 729.3140331627.

The spelling of 387921375 in words is "three hundred eighty-seven million, nine hundred twenty-one thousand, three hundred seventy-five".