18844457 has 2 divisors, whose sum is σ = 18844458. Its totient is φ = 18844456.

The previous prime is 18844417. The next prime is 18844459. The reversal of 18844457 is 75444881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13512976 + 5331481 = 3676^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 18844457 - 2⁶ = 18844393 is a prime.

It is a super-2 number, since 2×18844457² = 710227119249698, which contains 22 as substring.

Together with 18844459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18844459) 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 as a sum of consecutive naturals, namely, 9422228 + 9422229.

It is an arithmetic number, because the mean of its divisors is an integer number (9422229).

Almost surely, 2^18844457 is an apocalyptic number.

It is an amenable number.

18844457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18844457 is an equidigital number, since it uses as much as digits as its factorization.

18844457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 143360, while the sum is 41.

The square root of 18844457 is about 4341.0202717794. The cubic root of 18844457 is about 266.1100087688.

It can be divided in two parts, 188 and 44457, that multiplied together give a triangular number (8357916 = T₄₀₈₈).

The spelling of 18844457 in words is "eighteen million, eight hundred forty-four thousand, four hundred fifty-seven".