18690313 has 8 divisors (see below), whose sum is σ = 18975528. Its totient is φ = 18407424.

The previous prime is 18690311. The next prime is 18690317. The reversal of 18690313 is 31309681.

It can be written as a sum of positive squares in 4 ways, for example, as 644809 + 18045504 = 803^2 + 4248^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18690313 - 2¹ = 18690311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18690311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21381 + ... + 22237.

It is an arithmetic number, because the mean of its divisors is an integer number (2371941).

Almost surely, 2^18690313 is an apocalyptic number.

It is an amenable number.

18690313 is a deficient number, since it is larger than the sum of its proper divisors (285215).

18690313 is a wasteful number, since it uses less digits than its factorization.

18690313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 18690313 is about 4323.2294641853. The cubic root of 18690313 is about 265.3824453013.

Adding to 18690313 its reverse (31309681), we get a palindrome (49999994).

The spelling of 18690313 in words is "eighteen million, six hundred ninety thousand, three hundred thirteen".