18908963 has 8 divisors (see below), whose sum is σ = 19314240. Its totient is φ = 18506880.

The previous prime is 18908959. The next prime is 18908983. The reversal of 18908963 is 36980981.

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 18908963 - 2² = 18908959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18908983) 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, 13931 + ... + 15227.

It is an arithmetic number, because the mean of its divisors is an integer number (2414280).

Almost surely, 2^18908963 is an apocalyptic number.

18908963 is a deficient number, since it is larger than the sum of its proper divisors (405277).

18908963 is a wasteful number, since it uses less digits than its factorization.

18908963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18908963 is about 4348.4437446056. The cubic root of 18908963 is about 266.4133011888.

The spelling of 18908963 in words is "eighteen million, nine hundred eight thousand, nine hundred sixty-three".