18421319 has 16 divisors (see below), whose sum is σ = 22411008. Its totient is φ = 14781312.

The previous prime is 18421303. The next prime is 18421339. The reversal of 18421319 is 91312481.

It is not a de Polignac number, because 18421319 - 2⁴ = 18421303 is a prime.

It is a super-2 number, since 2×18421319² = 678689987399522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18421291 and 18421300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421339) 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 15 ways as a sum of consecutive naturals, for example, 33404 + ... + 33950.

It is an arithmetic number, because the mean of its divisors is an integer number (1400688).

Almost surely, 2^18421319 is an apocalyptic number.

18421319 is a deficient number, since it is larger than the sum of its proper divisors (3989689).

18421319 is a wasteful number, since it uses less digits than its factorization.

18421319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854.

The product of its digits is 1728, while the sum is 29.

The square root of 18421319 is about 4292.0064072646. The cubic root of 18421319 is about 264.1031459135.

The spelling of 18421319 in words is "eighteen million, four hundred twenty-one thousand, three hundred nineteen".