18036949 has 24 divisors (see below), whose sum is σ = 22654080. Its totient is φ = 14265216.

The previous prime is 18036943. The next prime is 18036959. The reversal of 18036949 is 94963081.

It is not a de Polignac number, because 18036949 - 2⁹ = 18036437 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 (18036943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48964 + ... + 49330.

It is an arithmetic number, because the mean of its divisors is an integer number (943920).

Almost surely, 2^18036949 is an apocalyptic number.

It is an amenable number.

18036949 is a deficient number, since it is larger than the sum of its proper divisors (4617131).

18036949 is a wasteful number, since it uses less digits than its factorization.

18036949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 18036949 is about 4246.9929361844. The cubic root of 18036949 is about 262.2533386646.

The spelling of 18036949 in words is "eighteen million, thirty-six thousand, nine hundred forty-nine".