18474487 has 2 divisors, whose sum is σ = 18474488. Its totient is φ = 18474486.

The previous prime is 18474457. The next prime is 18474503. The reversal of 18474487 is 78447481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18474487 - 2¹¹ = 18472439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18474457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9237243 + 9237244.

It is an arithmetic number, because the mean of its divisors is an integer number (9237244).

Almost surely, 2^18474487 is an apocalyptic number.

18474487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18474487 is an equidigital number, since it uses as much as digits as its factorization.

18474487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 200704, while the sum is 43.

The square root of 18474487 is about 4298.1957842797. The cubic root of 18474487 is about 264.3569885473.

The spelling of 18474487 in words is "eighteen million, four hundred seventy-four thousand, four hundred eighty-seven".