858623 has 2 divisors, whose sum is σ = 858624. Its totient is φ = 858622.

The previous prime is 858589. The next prime is 858631. The reversal of 858623 is 326858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 858623 - 2¹² = 854527 is a prime.

It is a super-2 number, since 2×858623² = 1474466912258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 858623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429311 + 429312.

It is an arithmetic number, because the mean of its divisors is an integer number (429312).

2⁸⁵⁸⁶²³ is an apocalyptic number.

858623 is a deficient number, since it is larger than the sum of its proper divisors (1).

858623 is an equidigital number, since it uses as much as digits as its factorization.

858623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 858623 is about 926.6191234806. The cubic root of 858623 is about 95.0460718359.

The spelling of 858623 in words is "eight hundred fifty-eight thousand, six hundred twenty-three".