47365721 has 4 divisors (see below), whose sum is σ = 51009252. Its totient is φ = 43722192.

The previous prime is 47365699. The next prime is 47365739. The reversal of 47365721 is 12756374.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2676496 + 44689225 = 1636^2 + 6685^2 .

It is a cyclic number.

It is not a de Polignac number, because 47365721 - 2⁶ = 47365657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47365741) 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, 1821746 + ... + 1821771.

It is an arithmetic number, because the mean of its divisors is an integer number (12752313).

Almost surely, 2^47365721 is an apocalyptic number.

It is an amenable number.

47365721 is a deficient number, since it is larger than the sum of its proper divisors (3643531).

47365721 is a wasteful number, since it uses less digits than its factorization.

47365721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643530.

The product of its digits is 35280, while the sum is 35.

The square root of 47365721 is about 6882.2758590455. The cubic root of 47365721 is about 361.8162355969.

The spelling of 47365721 in words is "forty-seven million, three hundred sixty-five thousand, seven hundred twenty-one".