139691280 has 80 divisors (see below), whose sum is σ = 444775104. Its totient is φ = 36241920.

The previous prime is 139691273. The next prime is 139691297. The reversal of 139691280 is 82196931.

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

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, 1015 + ... + 16745.

Almost surely, 2^139691280 is an apocalyptic number.

139691280 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 139691280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222387552).

139691280 is an abundant number, since it is smaller than the sum of its proper divisors (305083824).

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

139691280 is a wasteful number, since it uses less digits than its factorization.

139691280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15784 (or 15778 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 139691280 is about 11819.1065652189. The cubic root of 139691280 is about 518.8674562504.

The spelling of 139691280 in words is "one hundred thirty-nine million, six hundred ninety-one thousand, two hundred eighty".