139499933 has 4 divisors (see below), whose sum is σ = 139588668. Its totient is φ = 139411200.

The previous prime is 139499929. The next prime is 139499939. The reversal of 139499933 is 339994931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 339994931 = 71 ⋅4788661.

It can be written as a sum of positive squares in 2 ways, for example, as 120516484 + 18983449 = 10978^2 + 4357^2 .

It is a cyclic number.

It is not a de Polignac number, because 139499933 - 2² = 139499929 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 (139499939) 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, 41966 + ... + 45167.

It is an arithmetic number, because the mean of its divisors is an integer number (34897167).

Almost surely, 2^139499933 is an apocalyptic number.

It is an amenable number.

139499933 is a deficient number, since it is larger than the sum of its proper divisors (88735).

139499933 is an equidigital number, since it uses as much as digits as its factorization.

139499933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88734.

The product of its digits is 708588, while the sum is 50.

The square root of 139499933 is about 11811.0089746812. The cubic root of 139499933 is about 518.6304357336.

The spelling of 139499933 in words is "one hundred thirty-nine million, four hundred ninety-nine thousand, nine hundred thirty-three".