85723979 has 16 divisors (see below), whose sum is σ = 99364320. Its totient is φ = 73090560.

The previous prime is 85723961. The next prime is 85723993. The reversal of 85723979 is 97932758.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 85723979 - 2¹² = 85719883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85723679) 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, 69137 + ... + 70365.

It is an arithmetic number, because the mean of its divisors is an integer number (6210270).

Almost surely, 2^85723979 is an apocalyptic number.

85723979 is a deficient number, since it is larger than the sum of its proper divisors (13640341).

85723979 is a wasteful number, since it uses less digits than its factorization.

85723979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630.

The product of its digits is 952560, while the sum is 50.

The square root of 85723979 is about 9258.7244801862. The cubic root of 85723979 is about 440.9277583171.

The spelling of 85723979 in words is "eighty-five million, seven hundred twenty-three thousand, nine hundred seventy-nine".