18154973 has 2 divisors, whose sum is σ = 18154974. Its totient is φ = 18154972.

The previous prime is 18154967. The next prime is 18154979. The reversal of 18154973 is 37945181.

It is a balanced prime because it is at equal distance from previous prime (18154967) and next prime (18154979).

It can be written as a sum of positive squares in only one way, i.e., 15507844 + 2647129 = 3938^2 + 1627^2 .

It is a cyclic number.

It is not a de Polignac number, because 18154973 - 2⁶ = 18154909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18154979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9077486 + 9077487.

It is an arithmetic number, because the mean of its divisors is an integer number (9077487).

Almost surely, 2^18154973 is an apocalyptic number.

It is an amenable number.

18154973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18154973 is an equidigital number, since it uses as much as digits as its factorization.

18154973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 18154973 is about 4260.8652877086. The cubic root of 18154973 is about 262.8241100104.

The spelling of 18154973 in words is "eighteen million, one hundred fifty-four thousand, nine hundred seventy-three".