18456937 has 2 divisors, whose sum is σ = 18456938. Its totient is φ = 18456936.

The previous prime is 18456913. The next prime is 18456941. The reversal of 18456937 is 73965481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12787776 + 5669161 = 3576^2 + 2381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18456937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18456893 and 18456902.

It is not a weakly prime, because it can be changed into another prime (18456967) 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, 9228468 + 9228469.

It is an arithmetic number, because the mean of its divisors is an integer number (9228469).

Almost surely, 2^18456937 is an apocalyptic number.

It is an amenable number.

18456937 is a deficient number, since it is larger than the sum of its proper divisors (1).

18456937 is an equidigital number, since it uses as much as digits as its factorization.

18456937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The square root of 18456937 is about 4296.1537449211. The cubic root of 18456937 is about 264.2732526177.

It can be divided in two parts, 184 and 56937, that added together give a square (57121 = 239²).

The spelling of 18456937 in words is "eighteen million, four hundred fifty-six thousand, nine hundred thirty-seven".