18413021 has 8 divisors (see below), whose sum is σ = 20162784. Its totient is φ = 16675920.

The previous prime is 18412993. The next prime is 18413027. The reversal of 18413021 is 12031481.

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 18413021 - 2¹⁸ = 18150877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18412984 and 18413002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18413027) 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, 26 + ... + 6068.

It is an arithmetic number, because the mean of its divisors is an integer number (2520348).

Almost surely, 2^18413021 is an apocalyptic number.

18413021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18413021 is a deficient number, since it is larger than the sum of its proper divisors (1749763).

18413021 is a wasteful number, since it uses less digits than its factorization.

18413021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6331.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18413021 is about 4291.0396176218. The cubic root of 18413021 is about 264.0634843118.

The spelling of 18413021 in words is "eighteen million, four hundred thirteen thousand, twenty-one".