85123957 has 4 divisors (see below), whose sum is σ = 85919616. Its totient is φ = 84328300.

The previous prime is 85123921. The next prime is 85123963. The reversal of 85123957 is 75932158.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85123957 - 2¹⁵ = 85091189 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85123967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397669 + ... + 397882.

It is an arithmetic number, because the mean of its divisors is an integer number (21479904).

Almost surely, 2^85123957 is an apocalyptic number.

It is an amenable number.

85123957 is a deficient number, since it is larger than the sum of its proper divisors (795659).

85123957 is a wasteful number, since it uses less digits than its factorization.

85123957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795658.

The product of its digits is 75600, while the sum is 40.

The square root of 85123957 is about 9226.2645203788. The cubic root of 85123957 is about 439.8965958800.

It can be divided in two parts, 85 and 123957, that multiplied together give a triangular number (10536345 = T₄₅₉₀).

The spelling of 85123957 in words is "eighty-five million, one hundred twenty-three thousand, nine hundred fifty-seven".