18907648 has 20 divisors (see below), whose sum is σ = 37779390. Its totient is φ = 9453568.

The previous prime is 18907643. The next prime is 18907673. The reversal of 18907648 is 84670981.

It can be written as a sum of positive squares in only one way, i.e., 14379264 + 4528384 = 3792^2 + 2128^2 .

It is not an unprimeable number, because it can be changed into a prime (18907643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17953 + ... + 18976.

Almost surely, 2^18907648 is an apocalyptic number.

It is an amenable number.

18907648 is a deficient number, since it is larger than the sum of its proper divisors (18871742).

18907648 is an frugal number, since it uses more digits than its factorization.

18907648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36947 (or 36931 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 18907648 is about 4348.2925384569. The cubic root of 18907648 is about 266.4071252532.

The spelling of 18907648 in words is "eighteen million, nine hundred seven thousand, six hundred forty-eight".