863876421 has 24 divisors (see below), whose sum is σ = 1299820704. Its totient is φ = 573343920.

The previous prime is 863876413. The next prime is 863876443. The reversal of 863876421 is 124678368.

863876421 is a `hidden beast` number, since 8 + 638 + 7 + 6 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 863876421 - 2³ = 863876413 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863876491) 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, 47331 + ... + 62991.

It is an arithmetic number, because the mean of its divisors is an integer number (54159196).

Almost surely, 2^863876421 is an apocalyptic number.

863876421 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

863876421 is a deficient number, since it is larger than the sum of its proper divisors (435944283).

863876421 is a wasteful number, since it uses less digits than its factorization.

863876421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15903 (or 15891 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 863876421 is about 29391.7747167469. The cubic root of 863876421 is about 952.3952194244.

The spelling of 863876421 in words is "eight hundred sixty-three million, eight hundred seventy-six thousand, four hundred twenty-one".