139474728 has 48 divisors (see below), whose sum is σ = 380308500. Its totient is φ = 46176000.

The previous prime is 139474723. The next prime is 139474729. The reversal of 139474728 is 827474931.

139474728 is a `hidden beast` number, since 139 + 47 + 472 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 100761444 + 38713284 = 10038^2 + 6222^2 .

It is not an unprimeable number, because it can be changed into a prime (139474721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4228 + ... + 17228.

Almost surely, 2^139474728 is an apocalyptic number.

139474728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139474728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190154250).

139474728 is an abundant number, since it is smaller than the sum of its proper divisors (240833772).

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

139474728 is a wasteful number, since it uses less digits than its factorization.

139474728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13162 (or 13155 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 139474728 is about 11809.9419134897. The cubic root of 139474728 is about 518.5991982813.

The spelling of 139474728 in words is "one hundred thirty-nine million, four hundred seventy-four thousand, seven hundred twenty-eight".