18441457 has 4 divisors (see below), whose sum is σ = 19412080. Its totient is φ = 17470836.

The previous prime is 18441443. The next prime is 18441463. The reversal of 18441457 is 75414481.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75414481 = 881 ⋅85601.

It is a cyclic number.

It is not a de Polignac number, because 18441457 - 2¹⁹ = 17917169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18441407) 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, 485283 + ... + 485320.

It is an arithmetic number, because the mean of its divisors is an integer number (4853020).

Almost surely, 2^18441457 is an apocalyptic number.

It is an amenable number.

18441457 is a deficient number, since it is larger than the sum of its proper divisors (970623).

18441457 is an equidigital number, since it uses as much as digits as its factorization.

18441457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970622.

The product of its digits is 17920, while the sum is 34.

The square root of 18441457 is about 4294.3517555040. The cubic root of 18441457 is about 264.1993491636.

The spelling of 18441457 in words is "eighteen million, four hundred forty-one thousand, four hundred fifty-seven".