18313937 has 4 divisors (see below), whose sum is σ = 18326580. Its totient is φ = 18301296.

The previous prime is 18313907. The next prime is 18313949. The reversal of 18313937 is 73931381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73931381 = 281 ⋅263101.

It can be written as a sum of positive squares in 2 ways, for example, as 10042561 + 8271376 = 3169^2 + 2876^2 .

It is a cyclic number.

It is not a de Polignac number, because 18313937 - 2⁶ = 18313873 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18313897 and 18313906.

It is not an unprimeable number, because it can be changed into a prime (18313907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3818 + ... + 7155.

It is an arithmetic number, because the mean of its divisors is an integer number (4581645).

Almost surely, 2^18313937 is an apocalyptic number.

It is an amenable number.

18313937 is a deficient number, since it is larger than the sum of its proper divisors (12643).

18313937 is a wasteful number, since it uses less digits than its factorization.

18313937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12642.

The product of its digits is 13608, while the sum is 35.

The square root of 18313937 is about 4279.4785897350. The cubic root of 18313937 is about 263.5889733829.

The spelling of 18313937 in words is "eighteen million, three hundred thirteen thousand, nine hundred thirty-seven".