139781420 has 12 divisors (see below), whose sum is σ = 293541024. Its totient is φ = 55912560.

The previous prime is 139781417. The next prime is 139781437. The reversal of 139781420 is 24187931.

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, 3494516 + ... + 3494555.

It is an arithmetic number, because the mean of its divisors is an integer number (24461752).

Almost surely, 2^139781420 is an apocalyptic number.

139781420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139781420 is an abundant number, since it is smaller than the sum of its proper divisors (153759604).

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

139781420 is a wasteful number, since it uses less digits than its factorization.

139781420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6989080 (or 6989078 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 139781420 is about 11822.9192672538. The cubic root of 139781420 is about 518.9790371977.

The spelling of 139781420 in words is "one hundred thirty-nine million, seven hundred eighty-one thousand, four hundred twenty".