47187988 has 24 divisors (see below), whose sum is σ = 90455400. Its totient is φ = 21439488.

The previous prime is 47187961. The next prime is 47187989. The reversal of 47187988 is 88978174.

It can be written as a sum of positive squares in 4 ways, for example, as 17288964 + 29899024 = 4158^2 + 5468^2 .

It is a super-2 number, since 2×47187988² = 4453412422976288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47187989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9993 + ... + 13936.

It is an arithmetic number, because the mean of its divisors is an integer number (3768975).

Almost surely, 2^47187988 is an apocalyptic number.

It is an amenable number.

47187988 is a deficient number, since it is larger than the sum of its proper divisors (43267412).

47187988 is a wasteful number, since it uses less digits than its factorization.

47187988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23979 (or 23977 counting only the distinct ones).

The product of its digits is 903168, while the sum is 52.

The square root of 47187988 is about 6869.3513522020. The cubic root of 47187988 is about 361.3631140456.

The spelling of 47187988 in words is "forty-seven million, one hundred eighty-seven thousand, nine hundred eighty-eight".