139929973 has 4 divisors (see below), whose sum is σ = 140039820. Its totient is φ = 139820128.

The previous prime is 139929971. The next prime is 139929989. The reversal of 139929973 is 379929931.

139929973 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 can be written as a sum of positive squares in 2 ways, for example, as 89548369 + 50381604 = 9463^2 + 7098^2 .

It is a cyclic number.

It is not a de Polignac number, because 139929973 - 2¹ = 139929971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139929973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139929971) 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, 52990 + ... + 55567.

It is an arithmetic number, because the mean of its divisors is an integer number (35009955).

Almost surely, 2^139929973 is an apocalyptic number.

It is an amenable number.

139929973 is a deficient number, since it is larger than the sum of its proper divisors (109847).

139929973 is a wasteful number, since it uses less digits than its factorization.

139929973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109846.

The product of its digits is 826686, while the sum is 52.

The square root of 139929973 is about 11829.2000152166. The cubic root of 139929973 is about 519.1628207977.

The spelling of 139929973 in words is "one hundred thirty-nine million, nine hundred twenty-nine thousand, nine hundred seventy-three".