18465421 has 8 divisors (see below), whose sum is σ = 20021400. Its totient is φ = 16928832.

The previous prime is 18465413. The next prime is 18465449. The reversal of 18465421 is 12456481.

It can be written as a sum of positive squares in 4 ways, for example, as 741321 + 17724100 = 861^2 + 4210^2 .

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 18465421 - 2³ = 18465413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18465121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2830 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (2502675).

Almost surely, 2^18465421 is an apocalyptic number.

It is an amenable number.

18465421 is a deficient number, since it is larger than the sum of its proper divisors (1555979).

18465421 is a wasteful number, since it uses less digits than its factorization.

18465421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9695.

The product of its digits is 7680, while the sum is 31.

The square root of 18465421 is about 4297.1410263104. The cubic root of 18465421 is about 264.3137387653.

The spelling of 18465421 in words is "eighteen million, four hundred sixty-five thousand, four hundred twenty-one".