138933607 has 4 divisors (see below), whose sum is σ = 139144456. Its totient is φ = 138722760.

The previous prime is 138933601. The next prime is 138933629. The reversal of 138933607 is 706339831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 706339831 = 4423 ⋅159697.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138933607 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 138933607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138933601) 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, 104433 + ... + 105754.

It is an arithmetic number, because the mean of its divisors is an integer number (34786114).

Almost surely, 2^138933607 is an apocalyptic number.

138933607 is a deficient number, since it is larger than the sum of its proper divisors (210849).

138933607 is an equidigital number, since it uses as much as digits as its factorization.

138933607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210848.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 138933607 is about 11787.0100958640. The cubic root of 138933607 is about 517.9276581891.

The spelling of 138933607 in words is "one hundred thirty-eight million, nine hundred thirty-three thousand, six hundred seven".