139664093 has 4 divisors (see below), whose sum is σ = 140005980. Its totient is φ = 139322208.

The previous prime is 139664071. The next prime is 139664131. The reversal of 139664093 is 390466931.

139664093 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 61748164 + 77915929 = 7858^2 + 8827^2 .

It is a cyclic number.

It is not a de Polignac number, because 139664093 - 2¹² = 139659997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 139664093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139664053) 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, 170330 + ... + 171147.

It is an arithmetic number, because the mean of its divisors is an integer number (35001495).

Almost surely, 2^139664093 is an apocalyptic number.

It is an amenable number.

139664093 is a deficient number, since it is larger than the sum of its proper divisors (341887).

139664093 is an equidigital number, since it uses as much as digits as its factorization.

139664093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341886.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 139664093 is about 11817.9563800177. The cubic root of 139664093 is about 518.8337930545.

The spelling of 139664093 in words is "one hundred thirty-nine million, six hundred sixty-four thousand, ninety-three".