18436937 has 2 divisors, whose sum is σ = 18436938. Its totient is φ = 18436936.

The previous prime is 18436931. The next prime is 18436987. The reversal of 18436937 is 73963481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13512976 + 4923961 = 3676^2 + 2219^2 .

It is a cyclic number.

It is not a de Polignac number, because 18436937 - 2⁸ = 18436681 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18436894 and 18436903.

It is not a weakly prime, because it can be changed into another prime (18436931) 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, 9218468 + 9218469.

It is an arithmetic number, because the mean of its divisors is an integer number (9218469).

Almost surely, 2^18436937 is an apocalyptic number.

It is an amenable number.

18436937 is a deficient number, since it is larger than the sum of its proper divisors (1).

18436937 is an equidigital number, since it uses as much as digits as its factorization.

18436937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 18436937 is about 4293.8254505743. The cubic root of 18436937 is about 264.1777623184.

The spelling of 18436937 in words is "eighteen million, four hundred thirty-six thousand, nine hundred thirty-seven".