139391280 has 300 divisors, whose sum is σ = 564450480. Its totient is φ = 31788288.

The previous prime is 139391269. The next prime is 139391281. The reversal of 139391280 is 82193931.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139391281) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 317301 + ... + 317739.

Almost surely, 2^139391280 is an apocalyptic number.

139391280 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 139391280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282225240).

139391280 is an abundant number, since it is smaller than the sum of its proper divisors (425059200).

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

139391280 is a wasteful number, since it uses less digits than its factorization.

139391280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 139391280 is about 11806.4084293235. The cubic root of 139391280 is about 518.4957513460.

The spelling of 139391280 in words is "one hundred thirty-nine million, three hundred ninety-one thousand, two hundred eighty".