139349680 has 80 divisors (see below), whose sum is σ = 347656320. Its totient is φ = 51757056.

The previous prime is 139349677. The next prime is 139349719. The reversal of 139349680 is 86943931.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×139349680² = 38836666632204800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106792 + ... + 108088.

It is an arithmetic number, because the mean of its divisors is an integer number (4345704).

Almost surely, 2^139349680 is an apocalyptic number.

139349680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139349680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173828160).

139349680 is an abundant number, since it is smaller than the sum of its proper divisors (208306640).

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

139349680 is a wasteful number, since it uses less digits than its factorization.

With its successor (139349681) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1400).

139349680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406 (or 1400 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 139349680 is about 11804.6465427814. The cubic root of 139349680 is about 518.4441661743. Note that the first 3 decimals are identical.

The spelling of 139349680 in words is "one hundred thirty-nine million, three hundred forty-nine thousand, six hundred eighty".