139218972 has 12 divisors (see below), whose sum is σ = 324844296. Its totient is φ = 46406320.

The previous prime is 139218949. The next prime is 139218973. The reversal of 139218972 is 279812931.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139218973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5800779 + ... + 5800802.

It is an arithmetic number, because the mean of its divisors is an integer number (27070358).

Almost surely, 2^139218972 is an apocalyptic number.

139218972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

139218972 is an abundant number, since it is smaller than the sum of its proper divisors (185625324).

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

139218972 is a wasteful number, since it uses less digits than its factorization.

139218972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11601588 (or 11601586 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 139218972 is about 11799.1089494080. The cubic root of 139218972 is about 518.2820177369.

The spelling of 139218972 in words is "one hundred thirty-nine million, two hundred eighteen thousand, nine hundred seventy-two".