139391424 has 84 divisors (see below), whose sum is σ = 402645880. Its totient is φ = 46103040.

The previous prime is 139391387. The next prime is 139391459. The reversal of 139391424 is 424193931.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79194 + ... + 80934.

Almost surely, 2^139391424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139391424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201322940).

139391424 is an abundant number, since it is smaller than the sum of its proper divisors (263254456).

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

139391424 is a wasteful number, since it uses less digits than its factorization.

139391424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898 (or 1885 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 139391424 is about 11806.4145277048. The cubic root of 139391424 is about 518.4959298923.

The spelling of 139391424 in words is "one hundred thirty-nine million, three hundred ninety-one thousand, four hundred twenty-four".