85239999 has 32 divisors (see below), whose sum is σ = 138915840. Its totient is φ = 51329376.

The previous prime is 85239977. The next prime is 85240003. The reversal of 85239999 is 99993258.

It is not a de Polignac number, because 85239999 - 2¹⁵ = 85207231 is a prime.

It is a super-4 number, since 4×85239999⁴ (a number of 33 digits) contains 4444 as substring.

85239999 is a modest number, since divided by 9999 gives 8523 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85239929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13914 + ... + 19080.

It is an arithmetic number, because the mean of its divisors is an integer number (4341120).

Almost surely, 2^85239999 is an apocalyptic number.

85239999 is a deficient number, since it is larger than the sum of its proper divisors (53675841).

85239999 is a wasteful number, since it uses less digits than its factorization.

85239999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5236 (or 5230 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 54.

The square root of 85239999 is about 9232.5510559108. The cubic root of 85239999 is about 440.0963958909.

The spelling of 85239999 in words is "eighty-five million, two hundred thirty-nine thousand, nine hundred ninety-nine".