139861780 has 24 divisors (see below), whose sum is σ = 303838920. Its totient is φ = 54015360.

The previous prime is 139861769. The next prime is 139861807. The reversal of 139861780 is 87168931.

139861780 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5626384 + 134235396 = 2372^2 + 11586^2 .

It is a super-2 number, since 2×139861780² = 39122635009536800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119991 + ... + 121150.

It is an arithmetic number, because the mean of its divisors is an integer number (12659955).

Almost surely, 2^139861780 is an apocalyptic number.

139861780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139861780 is an abundant number, since it is smaller than the sum of its proper divisors (163977140).

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

139861780 is a wasteful number, since it uses less digits than its factorization.

139861780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241179 (or 241177 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 139861780 is about 11826.3172627830. The cubic root of 139861780 is about 519.0784714093.

The spelling of 139861780 in words is "one hundred thirty-nine million, eight hundred sixty-one thousand, seven hundred eighty".