15138805 has 8 divisors (see below), whose sum is σ = 19818144. Its totient is φ = 11010000.

The previous prime is 15138793. The next prime is 15138821. The reversal of 15138805 is 50883151.

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

It is not a de Polignac number, because 15138805 - 2⁷ = 15138677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137571 + ... + 137680.

It is an arithmetic number, because the mean of its divisors is an integer number (2477268).

Almost surely, 2^15138805 is an apocalyptic number.

It is an amenable number.

15138805 is a deficient number, since it is larger than the sum of its proper divisors (4679339).

15138805 is a wasteful number, since it uses less digits than its factorization.

15138805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275267.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 15138805 is about 3890.8617297457. The cubic root of 15138805 is about 247.3795897644.

The spelling of 15138805 in words is "fifteen million, one hundred thirty-eight thousand, eight hundred five".