387863491 has 4 divisors (see below), whose sum is σ = 388090584. Its totient is φ = 387636400.

The previous prime is 387863479. The next prime is 387863501. The reversal of 387863491 is 194368783.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194368783 = 7 ⋅27766969.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387863491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387863431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110965 + ... + 114406.

It is an arithmetic number, because the mean of its divisors is an integer number (97022646).

Almost surely, 2^387863491 is an apocalyptic number.

387863491 is a deficient number, since it is larger than the sum of its proper divisors (227093).

387863491 is a wasteful number, since it uses less digits than its factorization.

387863491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227092.

The product of its digits is 870912, while the sum is 49.

The square root of 387863491 is about 19694.2502015182. The cubic root of 387863491 is about 729.2777562982.

The spelling of 387863491 in words is "three hundred eighty-seven million, eight hundred sixty-three thousand, four hundred ninety-one".