18906121 has 8 divisors (see below), whose sum is σ = 21432320. Its totient is φ = 16533072.

The previous prime is 18906067. The next prime is 18906131. The reversal of 18906121 is 12160981.

It is a happy number.

18906121 is nontrivially palindromic in base 2.

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 18906121 - 2¹⁷ = 18775049 is a prime.

It is a super-2 number, since 2×18906121² = 714882822533282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18906121.

It is not an unprimeable number, because it can be changed into a prime (18906131) 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, 38025 + ... + 38518.

It is an arithmetic number, because the mean of its divisors is an integer number (2679040).

Almost surely, 2^18906121 is an apocalyptic number.

It is an amenable number.

18906121 is a deficient number, since it is larger than the sum of its proper divisors (2526199).

18906121 is a wasteful number, since it uses less digits than its factorization.

18906121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76575.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 18906121 is about 4348.1169487492. The cubic root of 18906121 is about 266.3999532941.

The spelling of 18906121 in words is "eighteen million, nine hundred six thousand, one hundred twenty-one".