47399915 has 4 divisors (see below), whose sum is σ = 56879904. Its totient is φ = 37919928.

The previous prime is 47399903. The next prime is 47399917. The reversal of 47399915 is 51999374.

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

It is a cyclic number.

It is not a de Polignac number, because 47399915 - 2¹² = 47395819 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 47399915.

It is not an unprimeable number, because it can be changed into a prime (47399917) 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, 4739987 + ... + 4739996.

It is an arithmetic number, because the mean of its divisors is an integer number (14219976).

Almost surely, 2^47399915 is an apocalyptic number.

47399915 is a deficient number, since it is larger than the sum of its proper divisors (9479989).

47399915 is an equidigital number, since it uses as much as digits as its factorization.

47399915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9479988.

The product of its digits is 306180, while the sum is 47.

The square root of 47399915 is about 6884.7596181711. The cubic root of 47399915 is about 361.9032814473.

The spelling of 47399915 in words is "forty-seven million, three hundred ninety-nine thousand, nine hundred fifteen".