47436921 has 20 divisors (see below), whose sum is σ = 80986752. Its totient is φ = 27106488.

The previous prime is 47436899. The next prime is 47436929. The reversal of 47436921 is 12963474.

It is not a de Polignac number, because 47436921 - 2⁷ = 47436793 is a prime.

It is a super-2 number, since 2×47436921² = 4500522947920482, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (47436929) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 41265 + ... + 42398.

Almost surely, 2^47436921 is an apocalyptic number.

It is an amenable number.

47436921 is a deficient number, since it is larger than the sum of its proper divisors (33549831).

47436921 is an equidigital number, since it uses as much as digits as its factorization.

47436921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83682 (or 83673 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 47436921 is about 6887.4466241126. The cubic root of 47436921 is about 361.9974385013.

It can be divided in two parts, 4743 and 6921, that added together give a square (11664 = 108²).

The spelling of 47436921 in words is "forty-seven million, four hundred thirty-six thousand, nine hundred twenty-one".