85390538 has 4 divisors (see below), whose sum is σ = 128085810. Its totient is φ = 42695268.

The previous prime is 85390537. The next prime is 85390549. The reversal of 85390538 is 83509358.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 85137529 + 253009 = 9227^2 + 503^2 .

It is a super-4 number, since 4×85390538⁴ (a number of 33 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85390495 and 85390504.

It is not an unprimeable number, because it can be changed into a prime (85390537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21347633 + ... + 21347636.

Almost surely, 2^85390538 is an apocalyptic number.

85390538 is a deficient number, since it is larger than the sum of its proper divisors (42695272).

85390538 is a wasteful number, since it uses less digits than its factorization.

85390538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42695271.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 85390538 is about 9240.7000817038. The cubic root of 85390538 is about 440.3553224858.

The spelling of 85390538 in words is "eighty-five million, three hundred ninety thousand, five hundred thirty-eight".