139997720 has 32 divisors (see below), whose sum is σ = 333525600. Its totient is φ = 52704768.

The previous prime is 139997713. The next prime is 139997731. The reversal of 139997720 is 27799931.

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, 102260 + ... + 103619.

It is an arithmetic number, because the mean of its divisors is an integer number (10422675).

Almost surely, 2^139997720 is an apocalyptic number.

139997720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139997720 is an abundant number, since it is smaller than the sum of its proper divisors (193527880).

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

139997720 is a wasteful number, since it uses less digits than its factorization.

139997720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205907 (or 205903 counting only the distinct ones).

The product of its (nonzero) digits is 214326, while the sum is 47.

The square root of 139997720 is about 11832.0632182219. The cubic root of 139997720 is about 519.2465913873.

The spelling of 139997720 in words is "one hundred thirty-nine million, nine hundred ninety-seven thousand, seven hundred twenty".