863826621 has 16 divisors (see below), whose sum is σ = 1385587200. Its totient is φ = 467635248.

The previous prime is 863826599. The next prime is 863826637. The reversal of 863826621 is 126628368.

It is not a de Polignac number, because 863826621 - 2¹⁸ = 863564477 is a prime.

It is a super-2 number, since 2×863826621² = 1492392862296555282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863828621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1082091 + ... + 1082888.

It is an arithmetic number, because the mean of its divisors is an integer number (86599200).

Almost surely, 2^863826621 is an apocalyptic number.

It is an amenable number.

863826621 is a deficient number, since it is larger than the sum of its proper divisors (521760579).

863826621 is a wasteful number, since it uses less digits than its factorization.

863826621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165008.

The product of its digits is 165888, while the sum is 42.

The square root of 863826621 is about 29390.9275287460. The cubic root of 863826621 is about 952.3769181210.

The spelling of 863826621 in words is "eight hundred sixty-three million, eight hundred twenty-six thousand, six hundred twenty-one".