85974021 has 16 divisors (see below), whose sum is σ = 145564800. Its totient is φ = 49127904.

The previous prime is 85974019. The next prime is 85974029. The reversal of 85974021 is 12047958.

85974021 is a `hidden beast` number, since 8 + 597 + 40 + 21 = 666.

It is not a de Polignac number, because 85974021 - 2¹ = 85974019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85974029) 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, 227256 + ... + 227633.

It is an arithmetic number, because the mean of its divisors is an integer number (9097800).

Almost surely, 2^85974021 is an apocalyptic number.

It is an amenable number.

85974021 is a deficient number, since it is larger than the sum of its proper divisors (59590779).

85974021 is a wasteful number, since it uses less digits than its factorization.

85974021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454905 (or 454899 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 85974021 is about 9272.2176958913. The cubic root of 85974021 is about 441.3560454754.

The spelling of 85974021 in words is "eighty-five million, nine hundred seventy-four thousand, twenty-one".