18665949 has 16 divisors (see below), whose sum is σ = 27499392. Its totient is φ = 11202048.

The previous prime is 18665929. The next prime is 18665951. The reversal of 18665949 is 94956681.

It is not a de Polignac number, because 18665949 - 2¹³ = 18657757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18665898 and 18665907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18665929) 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, 6784 + ... + 9129.

It is an arithmetic number, because the mean of its divisors is an integer number (1718712).

Almost surely, 2^18665949 is an apocalyptic number.

It is an amenable number.

18665949 is a deficient number, since it is larger than the sum of its proper divisors (8833443).

18665949 is a wasteful number, since it uses less digits than its factorization.

18665949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15956.

The product of its digits is 466560, while the sum is 48.

The square root of 18665949 is about 4320.4107443622. The cubic root of 18665949 is about 265.2670809153.

The spelling of 18665949 in words is "eighteen million, six hundred sixty-five thousand, nine hundred forty-nine".