139391983 has 4 divisors (see below), whose sum is σ = 145452528. Its totient is φ = 133331440.

The previous prime is 139391981. The next prime is 139392013. The reversal of 139391983 is 389193931.

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 139391983 - 2¹ = 139391981 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 (139391981) 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, 3030238 + ... + 3030283.

It is an arithmetic number, because the mean of its divisors is an integer number (36363132).

Almost surely, 2^139391983 is an apocalyptic number.

139391983 is a deficient number, since it is larger than the sum of its proper divisors (6060545).

139391983 is an equidigital number, since it uses as much as digits as its factorization.

139391983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6060544.

The product of its digits is 157464, while the sum is 46.

The square root of 139391983 is about 11806.4382012527. The cubic root of 139391983 is about 518.4966229976.

The spelling of 139391983 in words is "one hundred thirty-nine million, three hundred ninety-one thousand, nine hundred eighty-three".