18421629 has 16 divisors (see below), whose sum is σ = 25152000. Its totient is φ = 11989296.

The previous prime is 18421619. The next prime is 18421631. The reversal of 18421629 is 92612481.

It is not a de Polignac number, because 18421629 - 2¹¹ = 18419581 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18421629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421609) 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, 34962 + ... + 35484.

It is an arithmetic number, because the mean of its divisors is an integer number (1572000).

Almost surely, 2^18421629 is an apocalyptic number.

It is an amenable number.

18421629 is a deficient number, since it is larger than the sum of its proper divisors (6730371).

18421629 is a wasteful number, since it uses less digits than its factorization.

18421629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784.

The product of its digits is 6912, while the sum is 33.

The square root of 18421629 is about 4292.0425207586. The cubic root of 18421629 is about 264.1046273766.

The spelling of 18421629 in words is "eighteen million, four hundred twenty-one thousand, six hundred twenty-nine".