85139397 has 16 divisors (see below), whose sum is σ = 144151680. Its totient is φ = 48650976.

The previous prime is 85139371. The next prime is 85139401. The reversal of 85139397 is 79393158.

It is a happy number.

It is not a de Polignac number, because 85139397 - 2⁶ = 85139333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85139317) 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, 225048 + ... + 225425.

It is an arithmetic number, because the mean of its divisors is an integer number (9009480).

Almost surely, 2^85139397 is an apocalyptic number.

It is an amenable number.

85139397 is a deficient number, since it is larger than the sum of its proper divisors (59012283).

85139397 is a wasteful number, since it uses less digits than its factorization.

85139397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450489 (or 450483 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 85139397 is about 9227.1012241115. The cubic root of 85139397 is about 439.9231907936.

The spelling of 85139397 in words is "eighty-five million, one hundred thirty-nine thousand, three hundred ninety-seven".