18744973 has 6 divisors (see below), whose sum is σ = 20297994. Its totient is φ = 17302896.

The previous prime is 18744941. The next prime is 18744983. The reversal of 18744973 is 37944781.

It can be written as a sum of positive squares in 3 ways, for example, as 56644 + 18688329 = 238^2 + 4323^2 .

It is not a de Polignac number, because 18744973 - 2⁵ = 18744941 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 (18744983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55290 + ... + 55627.

It is an arithmetic number, because the mean of its divisors is an integer number (3382999).

Almost surely, 2^18744973 is an apocalyptic number.

18744973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18744973 is a deficient number, since it is larger than the sum of its proper divisors (1553021).

18744973 is a wasteful number, since it uses less digits than its factorization.

18744973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110943 (or 110930 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 18744973 is about 4329.5465120495. The cubic root of 18744973 is about 265.6408980196.

The spelling of 18744973 in words is "eighteen million, seven hundred forty-four thousand, nine hundred seventy-three".