139694985 has 48 divisors (see below), whose sum is σ = 256359168. Its totient is φ = 70224000.

The previous prime is 139694983. The next prime is 139694987. The reversal of 139694985 is 589496931.

It is an interprime number because it is at equal distance from previous prime (139694983) and next prime (139694987).

It is not a de Polignac number, because 139694985 - 2¹ = 139694983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139694983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72535 + ... + 74435.

It is an arithmetic number, because the mean of its divisors is an integer number (5340816).

Almost surely, 2^139694985 is an apocalyptic number.

139694985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139694985 is a deficient number, since it is larger than the sum of its proper divisors (116664183).

139694985 is a wasteful number, since it uses less digits than its factorization.

139694985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006 (or 2003 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 139694985 is about 11819.2633019152. The cubic root of 139694985 is about 518.8720434776.

The spelling of 139694985 in words is "one hundred thirty-nine million, six hundred ninety-four thousand, nine hundred eighty-five".