921357387 has 24 divisors (see below), whose sum is σ = 1368834480. Its totient is φ = 596756160.

The previous prime is 921357383. The next prime is 921357389. The reversal of 921357387 is 783753129.

It is a happy number.

921357387 is a `hidden beast` number, since 9 + 213 + 57 + 387 = 666.

It is not a de Polignac number, because 921357387 - 2² = 921357383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921357383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284437 + ... + 287657.

It is an arithmetic number, because the mean of its divisors is an integer number (57034770).

Almost surely, 2^921357387 is an apocalyptic number.

921357387 is a deficient number, since it is larger than the sum of its proper divisors (447477093).

921357387 is a wasteful number, since it uses less digits than its factorization.

921357387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4123 (or 4120 counting only the distinct ones).

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

The square root of 921357387 is about 30353.8693909030. The cubic root of 921357387 is about 973.0669170476.

The spelling of 921357387 in words is "nine hundred twenty-one million, three hundred fifty-seven thousand, three hundred eighty-seven".