139840428 has 96 divisors (see below), whose sum is σ = 406927360. Its totient is φ = 36391680.

The previous prime is 139840409. The next prime is 139840433. The reversal of 139840428 is 824048931.

139840428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 85458 + ... + 87078.

Almost surely, 2^139840428 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 139840428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203463680).

139840428 is an abundant number, since it is smaller than the sum of its proper divisors (267086932).

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

139840428 is a wasteful number, since it uses less digits than its factorization.

139840428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 139840428 is about 11825.4144959067. The cubic root of 139840428 is about 519.0520550251.

The spelling of 139840428 in words is "one hundred thirty-nine million, eight hundred forty thousand, four hundred twenty-eight".