18775421 has 8 divisors (see below), whose sum is σ = 21483840. Its totient is φ = 16073568.

The previous prime is 18775403. The next prime is 18775423. The reversal of 18775421 is 12457781.

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

It is not a de Polignac number, because 18775421 - 2⁶ = 18775357 is a prime.

It is a super-3 number, since 3×18775421³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18775423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10430 + ... + 12096.

It is an arithmetic number, because the mean of its divisors is an integer number (2685480).

Almost surely, 2^18775421 is an apocalyptic number.

It is an amenable number.

18775421 is a deficient number, since it is larger than the sum of its proper divisors (2708419).

18775421 is a wasteful number, since it uses less digits than its factorization.

18775421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283.

The product of its digits is 15680, while the sum is 35.

The square root of 18775421 is about 4333.0613889028. The cubic root of 18775421 is about 265.7846496038.

The spelling of 18775421 in words is "eighteen million, seven hundred seventy-five thousand, four hundred twenty-one".