139015812 has 48 divisors (see below), whose sum is σ = 350062272. Its totient is φ = 42683520.

The previous prime is 139015781. The next prime is 139015813. The reversal of 139015812 is 218510931.

It is a self number, because there is not a number n which added to its sum of digits gives 139015812.

It is not an unprimeable number, because it can be changed into a prime (139015813) 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, 146323 + ... + 147269.

It is an arithmetic number, because the mean of its divisors is an integer number (7292964).

Almost surely, 2^139015812 is an apocalyptic number.

139015812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

139015812 is an abundant number, since it is smaller than the sum of its proper divisors (211046460).

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

139015812 is a wasteful number, since it uses less digits than its factorization.

139015812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908 (or 1906 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 139015812 is about 11790.4966816500. The cubic root of 139015812 is about 518.0297881430.

The spelling of 139015812 in words is "one hundred thirty-nine million, fifteen thousand, eight hundred twelve".