139915440 has 480 divisors, whose sum is σ = 601675776. Its totient is φ = 28385280.

The previous prime is 139915429. The next prime is 139915441. The reversal of 139915440 is 44519931.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 139915395 and 139915404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139915441) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1970605 + ... + 1970675.

Almost surely, 2^139915440 is an apocalyptic number.

139915440 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 139915440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300837888).

139915440 is an abundant number, since it is smaller than the sum of its proper divisors (461760336).

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

139915440 is a wasteful number, since it uses less digits than its factorization.

139915440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 139915440 is about 11828.5857142771. The cubic root of 139915440 is about 519.1448469156.

The spelling of 139915440 in words is "one hundred thirty-nine million, nine hundred fifteen thousand, four hundred forty".