138810479 has 4 divisors (see below), whose sum is σ = 138834840. Its totient is φ = 138786120.

The previous prime is 138810439. The next prime is 138810499. The reversal of 138810479 is 974018831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138810479 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 (138810439) 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, 1457 + ... + 16725.

It is an arithmetic number, because the mean of its divisors is an integer number (34708710).

Almost surely, 2^138810479 is an apocalyptic number.

138810479 is a deficient number, since it is larger than the sum of its proper divisors (24361).

138810479 is an equidigital number, since it uses as much as digits as its factorization.

138810479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24360.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 138810479 is about 11781.7859002784. The cubic root of 138810479 is about 517.7746108782.

The spelling of 138810479 in words is "one hundred thirty-eight million, eight hundred ten thousand, four hundred seventy-nine".