18880921 has 8 divisors (see below), whose sum is σ = 19232000. Its totient is φ = 18532800.

The previous prime is 18880909. The next prime is 18880937. The reversal of 18880921 is 12908881.

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 18880921 - 2¹⁹ = 18356633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18880991) 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, 15121 + ... + 16321.

It is an arithmetic number, because the mean of its divisors is an integer number (2404000).

Almost surely, 2^18880921 is an apocalyptic number.

It is an amenable number.

18880921 is a deficient number, since it is larger than the sum of its proper divisors (351079).

18880921 is a wasteful number, since it uses less digits than its factorization.

18880921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 18880921 is about 4345.2181763405. The cubic root of 18880921 is about 266.2815390207.

The spelling of 18880921 in words is "eighteen million, eight hundred eighty thousand, nine hundred twenty-one".