18903709 has 6 divisors (see below), whose sum is σ = 20778590. Its totient is φ = 17185080.

The previous prime is 18903691. The next prime is 18903719. The reversal of 18903709 is 90730981.

It can be written as a sum of positive squares in only one way, i.e., 11035684 + 7868025 = 3322^2 + 2805^2 .

It is not a de Polignac number, because 18903709 - 2⁹ = 18903197 is a prime.

It is a super-3 number, since 3×18903709³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18903719) 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 in 5 ways as a sum of consecutive naturals, for example, 77994 + ... + 78235.

Almost surely, 2^18903709 is an apocalyptic number.

It is an amenable number.

18903709 is a deficient number, since it is larger than the sum of its proper divisors (1874881).

18903709 is a wasteful number, since it uses less digits than its factorization.

18903709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156251 (or 156240 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 18903709 is about 4347.8395784573. The cubic root of 18903709 is about 266.3886239119.

The spelling of 18903709 in words is "eighteen million, nine hundred three thousand, seven hundred nine".