18223401 has 8 divisors (see below), whose sum is σ = 27769024. Its totient is φ = 10413360.

The previous prime is 18223349. The next prime is 18223409. The reversal of 18223401 is 10432281.

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

It is not a de Polignac number, because 18223401 - 2⁷ = 18223273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 867781 = 18223401 / (1 + 8 + 2 + 2 + 3 + 4 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18223409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433870 + ... + 433911.

It is an arithmetic number, because the mean of its divisors is an integer number (3471128).

Almost surely, 2^18223401 is an apocalyptic number.

It is an amenable number.

18223401 is a deficient number, since it is larger than the sum of its proper divisors (9545623).

18223401 is an equidigital number, since it uses as much as digits as its factorization.

18223401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867791.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18223401 is about 4268.8875600090. The cubic root of 18223401 is about 263.1538999106.

Adding to 18223401 its reverse (10432281), we get a palindrome (28655682).

The spelling of 18223401 in words is "eighteen million, two hundred twenty-three thousand, four hundred one".