47997809 has 2 divisors, whose sum is σ = 47997810. Its totient is φ = 47997808.

The previous prime is 47997799. The next prime is 47997841. The reversal of 47997809 is 90879974.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47997184 + 625 = 6928^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 47997809 - 2¹² = 47993713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47997869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23998904 + 23998905.

It is an arithmetic number, because the mean of its divisors is an integer number (23998905).

Almost surely, 2^47997809 is an apocalyptic number.

It is an amenable number.

47997809 is a deficient number, since it is larger than the sum of its proper divisors (1).

47997809 is an equidigital number, since it uses as much as digits as its factorization.

47997809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 47997809 is about 6928.0451066661. The cubic root of 47997809 is about 363.4185888834.

The spelling of 47997809 in words is "forty-seven million, nine hundred ninety-seven thousand, eight hundred nine".