18842457 has 8 divisors (see below), whose sum is σ = 25405920. Its totient is φ = 12420320.

The previous prime is 18842437. The next prime is 18842491. The reversal of 18842457 is 75424881.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18842457 - 2⁶ = 18842393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18842407) 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 in 7 ways as a sum of consecutive naturals, for example, 35019 + ... + 35552.

It is an arithmetic number, because the mean of its divisors is an integer number (3175740).

Almost surely, 2^18842457 is an apocalyptic number.

It is an amenable number.

18842457 is a deficient number, since it is larger than the sum of its proper divisors (6563463).

18842457 is an equidigital number, since it uses as much as digits as its factorization.

18842457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70663.

The product of its digits is 71680, while the sum is 39.

The square root of 18842457 is about 4340.7899050749. The cubic root of 18842457 is about 266.1005941728.

The spelling of 18842457 in words is "eighteen million, eight hundred forty-two thousand, four hundred fifty-seven".