18690037 has 2 divisors, whose sum is σ = 18690038. Its totient is φ = 18690036.

The previous prime is 18690031. The next prime is 18690041. The reversal of 18690037 is 73009681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 1100401 = 4194^2 + 1049^2 .

It is a cyclic number.

It is not a de Polignac number, because 18690037 - 2³ = 18690029 is a prime.

It is a super-2 number, since 2×18690037² = 698634966122738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18689984 and 18690011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18690031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9345018 + 9345019.

It is an arithmetic number, because the mean of its divisors is an integer number (9345019).

Almost surely, 2^18690037 is an apocalyptic number.

It is an amenable number.

18690037 is a deficient number, since it is larger than the sum of its proper divisors (1).

18690037 is an equidigital number, since it uses as much as digits as its factorization.

18690037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 18690037 is about 4323.1975434856. The cubic root of 18690037 is about 265.3811389933.

The spelling of 18690037 in words is "eighteen million, six hundred ninety thousand, thirty-seven".