18898649 has 8 divisors (see below), whose sum is σ = 23562048. Its totient is φ = 14726160.

The previous prime is 18898643. The next prime is 18898657. The reversal of 18898649 is 94689881.

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 18898649 - 2⁸ = 18898393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18898649.

It is not an unprimeable number, because it can be changed into a prime (18898643) 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, 122642 + ... + 122795.

It is an arithmetic number, because the mean of its divisors is an integer number (2945256).

Almost surely, 2^18898649 is an apocalyptic number.

It is an amenable number.

18898649 is a deficient number, since it is larger than the sum of its proper divisors (4663399).

18898649 is a wasteful number, since it uses less digits than its factorization.

18898649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245455.

The product of its digits is 995328, while the sum is 53.

The square root of 18898649 is about 4347.2576413183. The cubic root of 18898649 is about 266.3648535022.

The spelling of 18898649 in words is "eighteen million, eight hundred ninety-eight thousand, six hundred forty-nine".