139869906 has 32 divisors (see below), whose sum is σ = 321235200. Its totient is φ = 40153680.

The previous prime is 139869883. The next prime is 139869907. The reversal of 139869906 is 609968931.

139869906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (139869907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54516 + ... + 57023.

It is an arithmetic number, because the mean of its divisors is an integer number (10038600).

Almost surely, 2^139869906 is an apocalyptic number.

139869906 is an abundant number, since it is smaller than the sum of its proper divisors (181365294).

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

139869906 is a wasteful number, since it uses less digits than its factorization.

139869906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111574.

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 139869906 is about 11826.6608136025. The cubic root of 139869906 is about 519.0885240722.

The spelling of 139869906 in words is "one hundred thirty-nine million, eight hundred sixty-nine thousand, nine hundred six".