858431 has 6 divisors (see below), whose sum is σ = 998640. Its totient is φ = 735756.

The previous prime is 858427. The next prime is 858433. The reversal of 858431 is 134858.

It is not a de Polignac number, because 858431 - 2² = 858427 is a prime.

It is a super-2 number, since 2×858431² = 1473807563522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 858394 and 858403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8711 + ... + 8808.

It is an arithmetic number, because the mean of its divisors is an integer number (166440).

2⁸⁵⁸⁴³¹ is an apocalyptic number.

858431 is a deficient number, since it is larger than the sum of its proper divisors (140209).

858431 is a wasteful number, since it uses less digits than its factorization.

858431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17533 (or 17526 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 858431 is about 926.5155152506. The cubic root of 858431 is about 95.0389867682.

The spelling of 858431 in words is "eight hundred fifty-eight thousand, four hundred thirty-one".