864623 has 2 divisors, whose sum is σ = 864624. Its totient is φ = 864622.

The previous prime is 864613. The next prime is 864629. The reversal of 864623 is 326468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864623 - 2¹⁸ = 602479 is a prime.

It is an Ulam number.

It is equal to p₆₈₆₉₀ and since 864623 and 68690 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432311 + 432312.

It is an arithmetic number, because the mean of its divisors is an integer number (432312).

2⁸⁶⁴⁶²³ is an apocalyptic number.

864623 is a deficient number, since it is larger than the sum of its proper divisors (1).

864623 is an equidigital number, since it uses as much as digits as its factorization.

864623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 864623 is about 929.8510633429. The cubic root of 864623 is about 95.2669499989.

The spelling of 864623 in words is "eight hundred sixty-four thousand, six hundred twenty-three".