85540039 has 32 divisors (see below), whose sum is σ = 101787840. Its totient is φ = 71165952.

The previous prime is 85540027. The next prime is 85540087. The reversal of 85540039 is 93004558.

It is not a de Polignac number, because 85540039 - 2¹⁵ = 85507271 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85539986 and 85540013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85540009) 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, 784717 + ... + 784825.

It is an arithmetic number, because the mean of its divisors is an integer number (3180870).

Almost surely, 2^85540039 is an apocalyptic number.

85540039 is a deficient number, since it is larger than the sum of its proper divisors (16247801).

85540039 is a wasteful number, since it uses less digits than its factorization.

85540039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 85540039 is about 9248.7858122026. The cubic root of 85540039 is about 440.6121627231.

The spelling of 85540039 in words is "eighty-five million, five hundred forty thousand, thirty-nine".