387474392991 has 32 divisors (see below), whose sum is σ = 607191879168. Its totient is φ = 215172956160.

The previous prime is 387474392971. The next prime is 387474393011. The reversal of 387474392991 is 199293474783.

It is an interprime number because it is at equal distance from previous prime (387474392971) and next prime (387474393011).

It is not a de Polignac number, because 387474392991 - 2⁷ = 387474392863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387474392941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 654265 + ... + 1096818.

It is an arithmetic number, because the mean of its divisors is an integer number (18974746224).

Almost surely, 2^387474392991 is an apocalyptic number.

387474392991 is a deficient number, since it is larger than the sum of its proper divisors (219717486177).

387474392991 is a wasteful number, since it uses less digits than its factorization.

387474392991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751391.

The product of its digits is 82301184, while the sum is 66.

The spelling of 387474392991 in words is "three hundred eighty-seven billion, four hundred seventy-four million, three hundred ninety-two thousand, nine hundred ninety-one".