139283971 has 4 divisors (see below), whose sum is σ = 139336200. Its totient is φ = 139231744.

The previous prime is 139283953. The next prime is 139283981. The reversal of 139283971 is 179382931.

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 139283971 - 2⁵ = 139283939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139283951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21886 + ... + 27523.

It is an arithmetic number, because the mean of its divisors is an integer number (34834050).

Almost surely, 2^139283971 is an apocalyptic number.

139283971 is a deficient number, since it is larger than the sum of its proper divisors (52229).

139283971 is an equidigital number, since it uses as much as digits as its factorization.

139283971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52228.

The product of its digits is 81648, while the sum is 43.

The square root of 139283971 is about 11801.8630308947. The cubic root of 139283971 is about 518.3626642441.

The spelling of 139283971 in words is "one hundred thirty-nine million, two hundred eighty-three thousand, nine hundred seventy-one".