18466921 has 8 divisors (see below), whose sum is σ = 20196000. Its totient is φ = 16746240.

The previous prime is 18466901. The next prime is 18466937. The reversal of 18466921 is 12966481.

It is a happy number.

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 18466921 - 2¹³ = 18458729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18466901) 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 7 ways as a sum of consecutive naturals, for example, 3070 + ... + 6808.

It is an arithmetic number, because the mean of its divisors is an integer number (2524500).

Almost surely, 2^18466921 is an apocalyptic number.

18466921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18466921 is a deficient number, since it is larger than the sum of its proper divisors (1729079).

18466921 is a wasteful number, since it uses less digits than its factorization.

18466921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4199.

The product of its digits is 20736, while the sum is 37.

The square root of 18466921 is about 4297.3155574149. The cubic root of 18466921 is about 264.3208955635.

The spelling of 18466921 in words is "eighteen million, four hundred sixty-six thousand, nine hundred twenty-one".