18700537 has 2 divisors, whose sum is σ = 18700538. Its totient is φ = 18700536.

The previous prime is 18700531. The next prime is 18700553. The reversal of 18700537 is 73500781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10342656 + 8357881 = 3216^2 + 2891^2 .

It is a cyclic number.

It is not a de Polignac number, because 18700537 - 2³ = 18700529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18700499 and 18700508.

It is not a weakly prime, because it can be changed into another prime (18700531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9350268 + 9350269.

It is an arithmetic number, because the mean of its divisors is an integer number (9350269).

Almost surely, 2^18700537 is an apocalyptic number.

It is an amenable number.

18700537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18700537 is an equidigital number, since it uses as much as digits as its factorization.

18700537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 18700537 is about 4324.4117519034. The cubic root of 18700537 is about 265.4308264339.

The spelling of 18700537 in words is "eighteen million, seven hundred thousand, five hundred thirty-seven".