139427780 has 12 divisors (see below), whose sum is σ = 292798380. Its totient is φ = 55771104.

The previous prime is 139427779. The next prime is 139427791. The reversal of 139427780 is 87724931.

It can be written as a sum of positive squares in 2 ways, for example, as 64224196 + 75203584 = 8014^2 + 8672^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3485675 + ... + 3485714.

It is an arithmetic number, because the mean of its divisors is an integer number (24399865).

Almost surely, 2^139427780 is an apocalyptic number.

139427780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139427780 is an abundant number, since it is smaller than the sum of its proper divisors (153370600).

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

139427780 is a wasteful number, since it uses less digits than its factorization.

139427780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6971398 (or 6971396 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 139427780 is about 11807.9540988268. The cubic root of 139427780 is about 518.5410039216.

The spelling of 139427780 in words is "one hundred thirty-nine million, four hundred twenty-seven thousand, seven hundred eighty".