139688394 has 64 divisors (see below), whose sum is σ = 298771200. Its totient is φ = 43476480.

The previous prime is 139688321. The next prime is 139688401. The reversal of 139688394 is 493886931.

139688394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 937432 + ... + 937580.

It is an arithmetic number, because the mean of its divisors is an integer number (4668300).

Almost surely, 2^139688394 is an apocalyptic number.

139688394 is an abundant number, since it is smaller than the sum of its proper divisors (159082806).

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

139688394 is a wasteful number, since it uses less digits than its factorization.

139688394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335.

The product of its digits is 1119744, while the sum is 51.

The square root of 139688394 is about 11818.9844741416. The cubic root of 139688394 is about 518.8638829856.

The spelling of 139688394 in words is "one hundred thirty-nine million, six hundred eighty-eight thousand, three hundred ninety-four".