18659949 has 16 divisors (see below), whose sum is σ = 31019520. Its totient is φ = 9693360.

The previous prime is 18659947. The next prime is 18659959. The reversal of 18659949 is 94995681.

It is not a de Polignac number, because 18659949 - 2¹ = 18659947 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18659947) 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, 40159 + ... + 40620.

It is an arithmetic number, because the mean of its divisors is an integer number (1938720).

Almost surely, 2^18659949 is an apocalyptic number.

It is an amenable number.

18659949 is a deficient number, since it is larger than the sum of its proper divisors (12359571).

18659949 is a wasteful number, since it uses less digits than its factorization.

18659949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80800.

The product of its digits is 699840, while the sum is 51.

The square root of 18659949 is about 4319.7163101296. The cubic root of 18659949 is about 265.2386553037.

The spelling of 18659949 in words is "eighteen million, six hundred fifty-nine thousand, nine hundred forty-nine".