139388844 has 48 divisors (see below), whose sum is σ = 372447488. Its totient is φ = 39745728.

The previous prime is 139388827. The next prime is 139388849. The reversal of 139388844 is 448883931.

139388844 = T₂₀₇₂ + T₂₀₇₃ + ... + T₂₁₃₄.

It is a junction number, because it is equal to n+sod(n) for n = 139388793 and 139388802.

It is not an unprimeable number, because it can be changed into a prime (139388849) 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, 50139 + ... + 52845.

Almost surely, 2^139388844 is an apocalyptic number.

139388844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

139388844 is an abundant number, since it is smaller than the sum of its proper divisors (233058644).

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

139388844 is a wasteful number, since it uses less digits than its factorization.

139388844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334 (or 3332 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 139388844 is about 11806.3052645610. The cubic root of 139388844 is about 518.4927309203.

The spelling of 139388844 in words is "one hundred thirty-nine million, three hundred eighty-eight thousand, eight hundred forty-four".