18011949 has 4 divisors (see below), whose sum is σ = 24015936. Its totient is φ = 12007964.

The previous prime is 18011941. The next prime is 18011977. The reversal of 18011949 is 94911081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18011949 - 2³ = 18011941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18011941) 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 3 ways as a sum of consecutive naturals, for example, 3001989 + ... + 3001994.

It is an arithmetic number, because the mean of its divisors is an integer number (6003984).

Almost surely, 2^18011949 is an apocalyptic number.

It is an amenable number.

18011949 is a deficient number, since it is larger than the sum of its proper divisors (6003987).

18011949 is an equidigital number, since it uses as much as digits as its factorization.

18011949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6003986.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 18011949 is about 4244.0486566485. The cubic root of 18011949 is about 262.1321177766.

The spelling of 18011949 in words is "eighteen million, eleven thousand, nine hundred forty-nine".