47400187 has 4 divisors (see below), whose sum is σ = 48203640. Its totient is φ = 46596736.

The previous prime is 47400173. The next prime is 47400203. The reversal of 47400187 is 78100474.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78100474 = 2 ⋅39050237.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47400187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47400107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401638 + ... + 401755.

It is an arithmetic number, because the mean of its divisors is an integer number (12050910).

Almost surely, 2^47400187 is an apocalyptic number.

47400187 is a deficient number, since it is larger than the sum of its proper divisors (803453).

47400187 is an equidigital number, since it uses as much as digits as its factorization.

47400187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803452.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 47400187 is about 6884.7793719189. The cubic root of 47400187 is about 361.9039736954.

The spelling of 47400187 in words is "forty-seven million, four hundred thousand, one hundred eighty-seven".