139497983 has 4 divisors (see below), whose sum is σ = 139538520. Its totient is φ = 139457448.

The previous prime is 139497973. The next prime is 139497989. The reversal of 139497983 is 389794931.

It is a happy number.

139497983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139497983 is a prime.

It is a super-2 number, since 2×139497983² = 38919374522136578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139497989) 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, 14573 + ... + 22166.

It is an arithmetic number, because the mean of its divisors is an integer number (34884630).

Almost surely, 2^139497983 is an apocalyptic number.

139497983 is a deficient number, since it is larger than the sum of its proper divisors (40537).

139497983 is an equidigital number, since it uses as much as digits as its factorization.

139497983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40536.

The product of its digits is 1469664, while the sum is 53.

The square root of 139497983 is about 11810.9264242903. The cubic root of 139497983 is about 518.6280191636.

The spelling of 139497983 in words is "one hundred thirty-nine million, four hundred ninety-seven thousand, nine hundred eighty-three".