18655949 has 8 divisors (see below), whose sum is σ = 20391840. Its totient is φ = 16963056.

The previous prime is 18655939. The next prime is 18655951. The reversal of 18655949 is 94955681.

It is a happy number.

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 18655949 - 2¹⁶ = 18590413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18655909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9839 + ... + 11580.

It is an arithmetic number, because the mean of its divisors is an integer number (2548980).

Almost surely, 2^18655949 is an apocalyptic number.

It is an amenable number.

18655949 is a deficient number, since it is larger than the sum of its proper divisors (1735891).

18655949 is a wasteful number, since it uses less digits than its factorization.

18655949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21499.

The product of its digits is 388800, while the sum is 47.

The square root of 18655949 is about 4319.2532919476. The cubic root of 18655949 is about 265.2197015106.

The spelling of 18655949 in words is "eighteen million, six hundred fifty-five thousand, nine hundred forty-nine".