138905794 has 4 divisors (see below), whose sum is σ = 208358694. Its totient is φ = 69452896.

The previous prime is 138905791. The next prime is 138905801. The reversal of 138905794 is 497509831.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 74183769 + 64722025 = 8613^2 + 8045^2 .

It is not an unprimeable number, because it can be changed into a prime (138905791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34726447 + ... + 34726450.

Almost surely, 2^138905794 is an apocalyptic number.

138905794 is a deficient number, since it is larger than the sum of its proper divisors (69452900).

138905794 is an equidigital number, since it uses as much as digits as its factorization.

138905794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69452899.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 138905794 is about 11785.8302210748. The cubic root of 138905794 is about 517.8930947175.

The spelling of 138905794 in words is "one hundred thirty-eight million, nine hundred five thousand, seven hundred ninety-four".