18774427 has 4 divisors (see below), whose sum is σ = 21456496. Its totient is φ = 16092360.

The previous prime is 18774421. The next prime is 18774439. The reversal of 18774427 is 72447781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72447781 = 7 ⋅10349683.

It is a cyclic number.

It is not a de Polignac number, because 18774427 - 2¹⁵ = 18741659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18774427.

It is not an unprimeable number, because it can be changed into a prime (18774421) 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, 1341024 + ... + 1341037.

It is an arithmetic number, because the mean of its divisors is an integer number (5364124).

Almost surely, 2^18774427 is an apocalyptic number.

18774427 is a deficient number, since it is larger than the sum of its proper divisors (2682069).

18774427 is an equidigital number, since it uses as much as digits as its factorization.

18774427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682068.

The product of its digits is 87808, while the sum is 40.

The square root of 18774427 is about 4332.9466878788. The cubic root of 18774427 is about 265.7799591701.

The spelling of 18774427 in words is "eighteen million, seven hundred seventy-four thousand, four hundred twenty-seven".