18742487 has 2 divisors, whose sum is σ = 18742488. Its totient is φ = 18742486.

The previous prime is 18742463. The next prime is 18742501. The reversal of 18742487 is 78424781.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18742487 - 2¹⁶ = 18676951 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18742457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371243 + 9371244.

It is an arithmetic number, because the mean of its divisors is an integer number (9371244).

Almost surely, 2^18742487 is an apocalyptic number.

18742487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742487 is an equidigital number, since it uses as much as digits as its factorization.

18742487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100352, while the sum is 41.

The square root of 18742487 is about 4329.2594054873. The cubic root of 18742487 is about 265.6291542049.

The spelling of 18742487 in words is "eighteen million, seven hundred forty-two thousand, four hundred eighty-seven".