985402639 has 8 divisors (see below), whose sum is σ = 1107342432. Its totient is φ = 870054240.

The previous prime is 985402631. The next prime is 985402661. The reversal of 985402639 is 936204589.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 985402639 - 2³ = 985402631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985402631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1647532 + ... + 1648129.

It is an arithmetic number, because the mean of its divisors is an integer number (138417804).

Almost surely, 2^985402639 is an apocalyptic number.

985402639 is a deficient number, since it is larger than the sum of its proper divisors (121939793).

985402639 is a wasteful number, since it uses less digits than its factorization.

985402639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295697.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 985402639 is about 31391.1235702069. The cubic root of 985402639 is about 995.1103432251.

The spelling of 985402639 in words is "nine hundred eighty-five million, four hundred two thousand, six hundred thirty-nine".