47187009 has 16 divisors (see below), whose sum is σ = 70012800. Its totient is φ = 31410288.

The previous prime is 47187001. The next prime is 47187011. The reversal of 47187009 is 90078174.

It is not a de Polignac number, because 47187009 - 2³ = 47187001 is a prime.

It is a super-2 number, since 2×47187009² = 4453227636732162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (47187001) 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 15 ways as a sum of consecutive naturals, for example, 32307 + ... + 33735.

It is an arithmetic number, because the mean of its divisors is an integer number (4375800).

Almost surely, 2^47187009 is an apocalyptic number.

It is an amenable number.

47187009 is a deficient number, since it is larger than the sum of its proper divisors (22825791).

47187009 is a wasteful number, since it uses less digits than its factorization.

47187009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661 (or 2655 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 47187009 is about 6869.2800932849. The cubic root of 47187009 is about 361.3606149849.

The spelling of 47187009 in words is "forty-seven million, one hundred eighty-seven thousand, nine".