47921787 has 24 divisors (see below), whose sum is σ = 72217600. Its totient is φ = 31755240.

The previous prime is 47921777. The next prime is 47921789. The reversal of 47921787 is 78712974.

It is a happy number.

47921787 is a `hidden beast` number, since 479 + 2 + 178 + 7 = 666.

It is not a de Polignac number, because 47921787 - 2⁶ = 47921723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47921789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47862 + ... + 48852.

Almost surely, 2^47921787 is an apocalyptic number.

47921787 is a deficient number, since it is larger than the sum of its proper divisors (24295813).

47921787 is an equidigital number, since it uses as much as digits as its factorization.

47921787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205 (or 1193 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 47921787 is about 6922.5563919697. The cubic root of 47921787 is about 363.2266189607.

The spelling of 47921787 in words is "forty-seven million, nine hundred twenty-one thousand, seven hundred eighty-seven".