18744949 has 4 divisors (see below), whose sum is σ = 19062720. Its totient is φ = 18427180.

The previous prime is 18744941. The next prime is 18744983. The reversal of 18744949 is 94944781.

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 18744949 - 2³ = 18744941 is a prime.

It is a super-2 number, since 2×18744949² = 702746226025202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18744899 and 18744908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18744941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158797 + ... + 158914.

It is an arithmetic number, because the mean of its divisors is an integer number (4765680).

Almost surely, 2^18744949 is an apocalyptic number.

It is an amenable number.

18744949 is a deficient number, since it is larger than the sum of its proper divisors (317771).

18744949 is an equidigital number, since it uses as much as digits as its factorization.

18744949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317770.

The product of its digits is 290304, while the sum is 46.

The square root of 18744949 is about 4329.5437403957. The cubic root of 18744949 is about 265.6407846491.

The spelling of 18744949 in words is "eighteen million, seven hundred forty-four thousand, nine hundred forty-nine".