139406289 has 32 divisors (see below), whose sum is σ = 215129088. Its totient is φ = 79464000.

The previous prime is 139406279. The next prime is 139406303. The reversal of 139406289 is 982604931.

139406289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139406289 - 2⁵ = 139406257 is a prime.

It is a super-2 number, since 2×139406289² = 38868226825503042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139406289.

It is not an unprimeable number, because it can be changed into a prime (139406279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44794 + ... + 47804.

It is an arithmetic number, because the mean of its divisors is an integer number (6722784).

Almost surely, 2^139406289 is an apocalyptic number.

It is an amenable number.

139406289 is a deficient number, since it is larger than the sum of its proper divisors (75722799).

139406289 is a wasteful number, since it uses less digits than its factorization.

139406289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 139406289 is about 11807.0440415881. The cubic root of 139406289 is about 518.5143604093.

The spelling of 139406289 in words is "one hundred thirty-nine million, four hundred six thousand, two hundred eighty-nine".