18634953 has 16 divisors (see below), whose sum is σ = 26766080. Its totient is φ = 11494224.

The previous prime is 18634933. The next prime is 18634963. The reversal of 18634953 is 35943681.

It is not a de Polignac number, because 18634953 - 2⁵ = 18634921 is a prime.

It is a super-2 number, since 2×18634953² = 694522946624418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18634933) 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 15 ways as a sum of consecutive naturals, for example, 1351 + ... + 6252.

It is an arithmetic number, because the mean of its divisors is an integer number (1672880).

Almost surely, 2^18634953 is an apocalyptic number.

It is an amenable number.

18634953 is a deficient number, since it is larger than the sum of its proper divisors (8131127).

18634953 is a wasteful number, since it uses less digits than its factorization.

18634953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7668.

The product of its digits is 77760, while the sum is 39.

The square root of 18634953 is about 4316.8220950139. The cubic root of 18634953 is about 265.1201685918.

The spelling of 18634953 in words is "eighteen million, six hundred thirty-four thousand, nine hundred fifty-three".