47997819 has 16 divisors (see below), whose sum is σ = 74851200. Its totient is φ = 30314088.

The previous prime is 47997809. The next prime is 47997841. The reversal of 47997819 is 91879974.

47997819 is a `hidden beast` number, since 479 + 97 + 81 + 9 = 666.

It is not a de Polignac number, because 47997819 - 2⁵ = 47997787 is a prime.

It is a super-2 number, since 2×47997819² = 4607581257513522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (47997809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46269 + ... + 47294.

It is an arithmetic number, because the mean of its divisors is an integer number (4678200).

Almost surely, 2^47997819 is an apocalyptic number.

47997819 is a deficient number, since it is larger than the sum of its proper divisors (26853381).

47997819 is a wasteful number, since it uses less digits than its factorization.

47997819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93591 (or 93585 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 47997819 is about 6928.0458283704. The cubic root of 47997819 is about 363.4186141219.

The spelling of 47997819 in words is "forty-seven million, nine hundred ninety-seven thousand, eight hundred nineteen".