139694688 has 216 divisors, whose sum is σ = 487370520. Its totient is φ = 37739520.

The previous prime is 139694683. The next prime is 139694689. The reversal of 139694688 is 886496931.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139694683) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 267868 + ... + 268388.

It is an arithmetic number, because the mean of its divisors is an integer number (2256345).

Almost surely, 2^139694688 is an apocalyptic number.

139694688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139694688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243685260).

139694688 is an abundant number, since it is smaller than the sum of its proper divisors (347675832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139694688 is a wasteful number, since it uses less digits than its factorization.

139694688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 552 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 139694688 is about 11819.2507376737. The cubic root of 139694688 is about 518.8716757596.

The spelling of 139694688 in words is "one hundred thirty-nine million, six hundred ninety-four thousand, six hundred eighty-eight".