18909963 has 16 divisors (see below), whose sum is σ = 28131840. Its totient is φ = 12553992.

The previous prime is 18909949. The next prime is 18909983. The reversal of 18909963 is 36990981.

It is not a de Polignac number, because 18909963 - 2⁵ = 18909931 is a prime.

It is a super-2 number, since 2×18909963² = 715173401322738, which contains 22 as substring.

18909963 is a modest number, since divided by 9963 gives 189 as remainder.

It is not an unprimeable number, because it can be changed into a prime (18909983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5770 + ... + 8432.

It is an arithmetic number, because the mean of its divisors is an integer number (1758240).

Almost surely, 2^18909963 is an apocalyptic number.

18909963 is a deficient number, since it is larger than the sum of its proper divisors (9221877).

18909963 is a wasteful number, since it uses less digits than its factorization.

18909963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2935 (or 2929 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 18909963 is about 4348.5587267507. The cubic root of 18909963 is about 266.4179975261.

The spelling of 18909963 in words is "eighteen million, nine hundred nine thousand, nine hundred sixty-three".