47987919 has 12 divisors (see below), whose sum is σ = 79218256. Its totient is φ = 27421632.

The previous prime is 47987909. The next prime is 47987921. The reversal of 47987919 is 91978974.

47987919 is a `hidden beast` number, since 479 + 87 + 91 + 9 = 666.

It is not a de Polignac number, because 47987919 - 2⁴ = 47987903 is a prime.

It is a super-2 number, since 2×47987919² = 4605680739901122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47987909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 380794 + ... + 380919.

Almost surely, 2^47987919 is an apocalyptic number.

47987919 is a deficient number, since it is larger than the sum of its proper divisors (31230337).

47987919 is a wasteful number, since it uses less digits than its factorization.

47987919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761726 (or 761723 counting only the distinct ones).

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

The square root of 47987919 is about 6927.3313043336. The cubic root of 47987919 is about 363.3936262388.

The spelling of 47987919 in words is "forty-seven million, nine hundred eighty-seven thousand, nine hundred nineteen".