18963121 has 8 divisors (see below), whose sum is σ = 20004320. Its totient is φ = 17926272.

The previous prime is 18963107. The next prime is 18963127. The reversal of 18963121 is 12136981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18963121 - 2¹¹ = 18961073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18963127) 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, 12046 + ... + 13528.

It is an arithmetic number, because the mean of its divisors is an integer number (2500540).

Almost surely, 2^18963121 is an apocalyptic number.

It is an amenable number.

18963121 is a deficient number, since it is larger than the sum of its proper divisors (1041199).

18963121 is a wasteful number, since it uses less digits than its factorization.

18963121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175.

The product of its digits is 2592, while the sum is 31.

The square root of 18963121 is about 4354.6665773627. Note that the first 3 decimals coincide. The cubic root of 18963121 is about 266.6674074632.

The spelling of 18963121 in words is "eighteen million, nine hundred sixty-three thousand, one hundred twenty-one".