18709937 has 2 divisors, whose sum is σ = 18709938. Its totient is φ = 18709936.

The previous prime is 18709931. The next prime is 18709949. The reversal of 18709937 is 73990781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17272336 + 1437601 = 4156^2 + 1199^2 .

It is a cyclic number.

It is not a de Polignac number, because 18709937 - 2¹⁴ = 18693553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18709931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9354968 + 9354969.

It is an arithmetic number, because the mean of its divisors is an integer number (9354969).

Almost surely, 2^18709937 is an apocalyptic number.

It is an amenable number.

18709937 is a deficient number, since it is larger than the sum of its proper divisors (1).

18709937 is an equidigital number, since it uses as much as digits as its factorization.

18709937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 18709937 is about 4325.4984683849. The cubic root of 18709937 is about 265.4752927475.

The spelling of 18709937 in words is "eighteen million, seven hundred nine thousand, nine hundred thirty-seven".