18636953 has 2 divisors, whose sum is σ = 18636954. Its totient is φ = 18636952.

The previous prime is 18636911. The next prime is 18637009. The reversal of 18636953 is 35963681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14807104 + 3829849 = 3848^2 + 1957^2 .

It is a cyclic number.

It is not a de Polignac number, because 18636953 - 2¹² = 18632857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18636953.

It is not a weakly prime, because it can be changed into another prime (18606953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9318476 + 9318477.

It is an arithmetic number, because the mean of its divisors is an integer number (9318477).

Almost surely, 2^18636953 is an apocalyptic number.

It is an amenable number.

18636953 is a deficient number, since it is larger than the sum of its proper divisors (1).

18636953 is an equidigital number, since it uses as much as digits as its factorization.

18636953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 18636953 is about 4317.0537406894. The cubic root of 18636953 is about 265.1296529439.

The spelling of 18636953 in words is "eighteen million, six hundred thirty-six thousand, nine hundred fifty-three".