18341421 has 16 divisors (see below), whose sum is σ = 28545024. Its totient is φ = 10257264.

The previous prime is 18341417. The next prime is 18341431. The reversal of 18341421 is 12414381.

It is not a de Polignac number, because 18341421 - 2² = 18341417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18341391 and 18341400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18341431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8305 + ... + 10278.

It is an arithmetic number, because the mean of its divisors is an integer number (1784064).

Almost surely, 2^18341421 is an apocalyptic number.

It is an amenable number.

18341421 is a deficient number, since it is larger than the sum of its proper divisors (10203603).

18341421 is a wasteful number, since it uses less digits than its factorization.

18341421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18640.

The product of its digits is 768, while the sum is 24.

The square root of 18341421 is about 4282.6885247470. The cubic root of 18341421 is about 263.7207647866.

The spelling of 18341421 in words is "eighteen million, three hundred forty-one thousand, four hundred twenty-one".