18953649 has 32 divisors (see below), whose sum is σ = 32995200. Its totient is φ = 10601280.

The previous prime is 18953639. The next prime is 18953651. The reversal of 18953649 is 94635981.

It is a happy number.

It is not a de Polignac number, because 18953649 - 2¹¹ = 18951601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18953609) 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 31 ways as a sum of consecutive naturals, for example, 1407 + ... + 6315.

It is an arithmetic number, because the mean of its divisors is an integer number (1031100).

Almost surely, 2^18953649 is an apocalyptic number.

It is an amenable number.

18953649 is a deficient number, since it is larger than the sum of its proper divisors (14041551).

18953649 is a wasteful number, since it uses less digits than its factorization.

18953649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4942 (or 4936 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 18953649 is about 4353.5788726058. The cubic root of 18953649 is about 266.6230003154.

The spelling of 18953649 in words is "eighteen million, nine hundred fifty-three thousand, six hundred forty-nine".