139807997 has 8 divisors (see below), whose sum is σ = 159960000. Its totient is φ = 119700864.

The previous prime is 139807981. The next prime is 139807999. The reversal of 139807997 is 799708931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139807997 - 2⁴ = 139807981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139807999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4247 + ... + 17252.

It is an arithmetic number, because the mean of its divisors is an integer number (19995000).

Almost surely, 2^139807997 is an apocalyptic number.

It is an amenable number.

139807997 is a deficient number, since it is larger than the sum of its proper divisors (20152003).

139807997 is an equidigital number, since it uses as much as digits as its factorization.

139807997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22435.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 139807997 is about 11824.0431748197. The cubic root of 139807997 is about 519.0119267186.

The spelling of 139807997 in words is "one hundred thirty-nine million, eight hundred seven thousand, nine hundred ninety-seven".