139993840 has 40 divisors (see below), whose sum is σ = 371985120. Its totient is φ = 47997696.

The previous prime is 139993781. The next prime is 139993877. The reversal of 139993840 is 48399931.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124435 + ... + 125554.

It is an arithmetic number, because the mean of its divisors is an integer number (9299628).

Almost surely, 2^139993840 is an apocalyptic number.

139993840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139993840 is an abundant number, since it is smaller than the sum of its proper divisors (231991280).

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

139993840 is a wasteful number, since it uses less digits than its factorization.

139993840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250009 (or 250003 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 139993840 is about 11831.8992558253. The cubic root of 139993840 is about 519.2417944154.

The spelling of 139993840 in words is "one hundred thirty-nine million, nine hundred ninety-three thousand, eight hundred forty".