139875220 has 24 divisors (see below), whose sum is σ = 294623784. Its totient is φ = 55781376.

The previous prime is 139875209. The next prime is 139875223. The reversal of 139875220 is 22578931.

It can be written as a sum of positive squares in 4 ways, for example, as 1483524 + 138391696 = 1218^2 + 11764^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 139875220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139875223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3637 + ... + 17116.

It is an arithmetic number, because the mean of its divisors is an integer number (12275991).

Almost surely, 2^139875220 is an apocalyptic number.

139875220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139875220 is an abundant number, since it is smaller than the sum of its proper divisors (154748564).

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

139875220 is a wasteful number, since it uses less digits than its factorization.

139875220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21099 (or 21097 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 139875220 is about 11826.8854733611. The cubic root of 139875220 is about 519.0950978034.

The spelling of 139875220 in words is "one hundred thirty-nine million, eight hundred seventy-five thousand, two hundred twenty".