139982721 has 4 divisors (see below), whose sum is σ = 186643632. Its totient is φ = 93321812.

The previous prime is 139982719. The next prime is 139982753. The reversal of 139982721 is 127289931.

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 a cyclic number.

It is not a de Polignac number, because 139982721 - 2¹ = 139982719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139982771) 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, 23330451 + ... + 23330456.

It is an arithmetic number, because the mean of its divisors is an integer number (46660908).

Almost surely, 2^139982721 is an apocalyptic number.

It is an amenable number.

139982721 is a deficient number, since it is larger than the sum of its proper divisors (46660911).

139982721 is an equidigital number, since it uses as much as digits as its factorization.

139982721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46660910.

The product of its digits is 54432, while the sum is 42.

The square root of 139982721 is about 11831.4293726498. The cubic root of 139982721 is about 519.2280471382.

The spelling of 139982721 in words is "one hundred thirty-nine million, nine hundred eighty-two thousand, seven hundred twenty-one".