139187992 has 8 divisors (see below), whose sum is σ = 260977500. Its totient is φ = 69593992.

The previous prime is 139187957. The next prime is 139188013. The reversal of 139187992 is 299781931.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8699242 + ... + 8699257.

Almost surely, 2^139187992 is an apocalyptic number.

It is an amenable number.

139187992 is a deficient number, since it is larger than the sum of its proper divisors (121789508).

139187992 is a wasteful number, since it uses less digits than its factorization.

139187992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17398505 (or 17398501 counting only the distinct ones).

The product of its digits is 244944, while the sum is 49.

The square root of 139187992 is about 11797.7960653675. The cubic root of 139187992 is about 518.2435709462.

The spelling of 139187992 in words is "one hundred thirty-nine million, one hundred eighty-seven thousand, nine hundred ninety-two".