138447794 has 8 divisors (see below), whose sum is σ = 218601840. Its totient is φ = 65580516.

The previous prime is 138447773. The next prime is 138447817. The reversal of 138447794 is 497744831.

It is a happy number.

138447794 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1821644 + ... + 1821719.

It is an arithmetic number, because the mean of its divisors is an integer number (27325230).

Almost surely, 2^138447794 is an apocalyptic number.

138447794 is a deficient number, since it is larger than the sum of its proper divisors (80154046).

138447794 is a wasteful number, since it uses less digits than its factorization.

138447794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3643384.

The product of its digits is 677376, while the sum is 47.

The square root of 138447794 is about 11766.3840664836. The cubic root of 138447794 is about 517.3232691732.

The spelling of 138447794 in words is "one hundred thirty-eight million, four hundred forty-seven thousand, seven hundred ninety-four".