18974507 has 2 divisors, whose sum is σ = 18974508. Its totient is φ = 18974506.

The previous prime is 18974491. The next prime is 18974519. The reversal of 18974507 is 70547981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18974507 - 2⁴ = 18974491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18974807) 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 as a sum of consecutive naturals, namely, 9487253 + 9487254.

It is an arithmetic number, because the mean of its divisors is an integer number (9487254).

Almost surely, 2^18974507 is an apocalyptic number.

18974507 is a deficient number, since it is larger than the sum of its proper divisors (1).

18974507 is an equidigital number, since it uses as much as digits as its factorization.

18974507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 18974507 is about 4355.9737143376. The cubic root of 18974507 is about 266.7207683633.

The spelling of 18974507 in words is "eighteen million, nine hundred seventy-four thousand, five hundred seven".