18945507 has 18 divisors (see below), whose sum is σ = 29466948. Its totient is φ = 10795848.

The previous prime is 18945503. The next prime is 18945529. The reversal of 18945507 is 70554981.

It is not a de Polignac number, because 18945507 - 2² = 18945503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18945503) 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 17 ways as a sum of consecutive naturals, for example, 52594 + ... + 52952.

Almost surely, 2^18945507 is an apocalyptic number.

18945507 is a deficient number, since it is larger than the sum of its proper divisors (10521441).

18945507 is an frugal number, since it uses more digits than its factorization.

18945507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 18945507 is about 4352.6436794206. The cubic root of 18945507 is about 266.5848167200.

The spelling of 18945507 in words is "eighteen million, nine hundred forty-five thousand, five hundred seven".