139997707 has 4 divisors (see below), whose sum is σ = 140030440. Its totient is φ = 139964976.

The previous prime is 139997699. The next prime is 139997713. The reversal of 139997707 is 707799931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139997707 - 2³ = 139997699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139997777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8778 + ... + 18895.

It is an arithmetic number, because the mean of its divisors is an integer number (35007610).

Almost surely, 2^139997707 is an apocalyptic number.

139997707 is a deficient number, since it is larger than the sum of its proper divisors (32733).

139997707 is an equidigital number, since it uses as much as digits as its factorization.

139997707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32732.

The product of its (nonzero) digits is 750141, while the sum is 52.

The square root of 139997707 is about 11832.0626688672. The cubic root of 139997707 is about 519.2465753151.

The spelling of 139997707 in words is "one hundred thirty-nine million, nine hundred ninety-seven thousand, seven hundred seven".