18704537 has 2 divisors, whose sum is σ = 18704538. Its totient is φ = 18704536.

The previous prime is 18704533. The next prime is 18704557. The reversal of 18704537 is 73540781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15241216 + 3463321 = 3904^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 18704537 - 2² = 18704533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18704497 and 18704506.

It is not a weakly prime, because it can be changed into another prime (18704533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9352268 + 9352269.

It is an arithmetic number, because the mean of its divisors is an integer number (9352269).

Almost surely, 2^18704537 is an apocalyptic number.

It is an amenable number.

18704537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18704537 is an equidigital number, since it uses as much as digits as its factorization.

18704537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 18704537 is about 4324.8742178241. The cubic root of 18704537 is about 265.4497500904.

The spelling of 18704537 in words is "eighteen million, seven hundred four thousand, five hundred thirty-seven".