18420413 has 8 divisors (see below), whose sum is σ = 20638560. Its totient is φ = 16292880.

The previous prime is 18420407. The next prime is 18420421. The reversal of 18420413 is 31402481.

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 18420413 - 2⁶ = 18420349 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 (18420433) 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, 22223 + ... + 23036.

It is an arithmetic number, because the mean of its divisors is an integer number (2579820).

Almost surely, 2^18420413 is an apocalyptic number.

It is an amenable number.

18420413 is a deficient number, since it is larger than the sum of its proper divisors (2218147).

18420413 is a wasteful number, since it uses less digits than its factorization.

18420413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45307.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18420413 is about 4291.9008609240. The cubic root of 18420413 is about 264.0988161226.

Adding to 18420413 its reverse (31402481), we get a palindrome (49822894).

The spelling of 18420413 in words is "eighteen million, four hundred twenty thousand, four hundred thirteen".