139959840 has 96 divisors (see below), whose sum is σ = 451192896. Its totient is φ = 36449280.

The previous prime is 139959817. The next prime is 139959901. The reversal of 139959840 is 48959931.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 139959840.

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, 17250 + ... + 24030.

It is an arithmetic number, because the mean of its divisors is an integer number (4699926).

Almost surely, 2^139959840 is an apocalyptic number.

139959840 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 139959840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225596448).

139959840 is an abundant number, since it is smaller than the sum of its proper divisors (311233056).

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

139959840 is a wasteful number, since it uses less digits than its factorization.

139959840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6842 (or 6834 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 139959840 is about 11830.4623747341. The cubic root of 139959840 is about 519.1997553028.

Subtracting from 139959840 its reverse (48959931), we obtain a palindrome (90999909).

The spelling of 139959840 in words is "one hundred thirty-nine million, nine hundred fifty-nine thousand, eight hundred forty".