863413821 has 12 divisors (see below), whose sum is σ = 1247766780. Its totient is φ = 575326080.

The previous prime is 863413801. The next prime is 863413849. The reversal of 863413821 is 128314368.

863413821 is a `hidden beast` number, since 8 + 634 + 13 + 8 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 531809721 + 331604100 = 23061^2 + 18210^2 .

It is not a de Polignac number, because 863413821 - 2⁶ = 863413757 is a prime.

It is a Smith number, since the sum of its digits (36) 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 (863413801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3370 + ... + 41691.

It is an arithmetic number, because the mean of its divisors is an integer number (103980565).

Almost surely, 2^863413821 is an apocalyptic number.

It is an amenable number.

863413821 is a deficient number, since it is larger than the sum of its proper divisors (384352959).

863413821 is a wasteful number, since it uses less digits than its factorization.

863413821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47196 (or 47193 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 863413821 is about 29383.9041143276. The cubic root of 863413821 is about 952.2251886641.

The spelling of 863413821 in words is "eight hundred sixty-three million, four hundred thirteen thousand, eight hundred twenty-one".