139937997 has 4 divisors (see below), whose sum is σ = 186584000. Its totient is φ = 93291996.

The previous prime is 139937981. The next prime is 139938011. The reversal of 139937997 is 799739931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 139937997 - 2⁴ = 139937981 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 (139937977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23322997 + ... + 23323002.

It is an arithmetic number, because the mean of its divisors is an integer number (46646000).

Almost surely, 2^139937997 is an apocalyptic number.

It is an amenable number.

139937997 is a deficient number, since it is larger than the sum of its proper divisors (46646003).

139937997 is an equidigital number, since it uses as much as digits as its factorization.

139937997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46646002.

The product of its digits is 2893401, while the sum is 57.

The square root of 139937997 is about 11829.5391710751. The cubic root of 139937997 is about 519.1727440537.

The spelling of 139937997 in words is "one hundred thirty-nine million, nine hundred thirty-seven thousand, nine hundred ninety-seven".