139873440 has 288 divisors, whose sum is σ = 541235520. Its totient is φ = 30191616.

The previous prime is 139873439. The next prime is 139873451. The reversal of 139873440 is 44378931.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 446724 + ... + 447036.

It is an arithmetic number, because the mean of its divisors is an integer number (1879290).

Almost surely, 2^139873440 is an apocalyptic number.

139873440 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 139873440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270617760).

139873440 is an abundant number, since it is smaller than the sum of its proper divisors (401362080).

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

139873440 is a wasteful number, since it uses less digits than its factorization.

139873440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 139873440 is about 11826.8102208499. The cubic root of 139873440 is about 519.0928958570.

The spelling of 139873440 in words is "one hundred thirty-nine million, eight hundred seventy-three thousand, four hundred forty".