387940387 has 4 divisors (see below), whose sum is σ = 390901896. Its totient is φ = 384978880.

The previous prime is 387940381. The next prime is 387940393. The reversal of 387940387 is 783049783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 783049783 = 1301 ⋅601883.

It is an interprime number because it is at equal distance from previous prime (387940381) and next prime (387940393).

It is a cyclic number.

It is not a de Polignac number, because 387940387 - 2²⁷ = 253722659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 387940387.

It is not an unprimeable number, because it can be changed into a prime (387940381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1480558 + ... + 1480819.

It is an arithmetic number, because the mean of its divisors is an integer number (97725474).

Almost surely, 2^387940387 is an apocalyptic number.

387940387 is a deficient number, since it is larger than the sum of its proper divisors (2961509).

387940387 is a wasteful number, since it uses less digits than its factorization.

387940387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961508.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 387940387 is about 19696.2023496917. The cubic root of 387940387 is about 729.3259475116.

The spelling of 387940387 in words is "three hundred eighty-seven million, nine hundred forty thousand, three hundred eighty-seven".