139661928 has 64 divisors (see below), whose sum is σ = 443376000. Its totient is φ = 39902976.

The previous prime is 139661927. The next prime is 139661947. The reversal of 139661928 is 829166931.

It is a happy number.

139661928 is a `hidden beast` number, since 1 + 3 + 9 + 6 + 619 + 28 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (139661927) 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, 44673 + ... + 47696.

It is an arithmetic number, because the mean of its divisors is an integer number (6927750).

Almost surely, 2^139661928 is an apocalyptic number.

139661928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139661928 is an abundant number, since it is smaller than the sum of its proper divisors (303714072).

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

139661928 is a wasteful number, since it uses less digits than its factorization.

139661928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92391 (or 92381 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 139661928 is about 11817.8647817616. The cubic root of 139661928 is about 518.8311121436.

The spelling of 139661928 in words is "one hundred thirty-nine million, six hundred sixty-one thousand, nine hundred twenty-eight".