18613956 has 12 divisors (see below), whose sum is σ = 43432592. Its totient is φ = 6204648.

The previous prime is 18613937. The next prime is 18613957. The reversal of 18613956 is 65931681.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18613957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775570 + ... + 775593.

Almost surely, 2^18613956 is an apocalyptic number.

It is an amenable number.

18613956 is an abundant number, since it is smaller than the sum of its proper divisors (24818636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18613956 is a wasteful number, since it uses less digits than its factorization.

18613956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551170 (or 1551168 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 18613956 is about 4314.3894121880. The cubic root of 18613956 is about 265.0205561365.

The spelling of 18613956 in words is "eighteen million, six hundred thirteen thousand, nine hundred fifty-six".