18916047 has 12 divisors (see below), whose sum is σ = 27990144. Its totient is φ = 12302880.

The previous prime is 18916031. The next prime is 18916063. The reversal of 18916047 is 74061981.

It is an interprime number because it is at equal distance from previous prime (18916031) and next prime (18916063).

It is not a de Polignac number, because 18916047 - 2⁴ = 18916031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18916747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25263 + ... + 26000.

It is an arithmetic number, because the mean of its divisors is an integer number (2332512).

Almost surely, 2^18916047 is an apocalyptic number.

18916047 is a deficient number, since it is larger than the sum of its proper divisors (9074097).

18916047 is a wasteful number, since it uses less digits than its factorization.

18916047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51310 (or 51307 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 18916047 is about 4349.2582126151. The cubic root of 18916047 is about 266.4465664749.

The spelling of 18916047 in words is "eighteen million, nine hundred sixteen thousand, forty-seven".