18634121 has 6 divisors (see below), whose sum is σ = 20482266. Its totient is φ = 16940000.

The previous prime is 18634073. The next prime is 18634127. The reversal of 18634121 is 12143681.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 698896 = 4235^2 + 836^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18634121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18634127) 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 5 ways as a sum of consecutive naturals, for example, 76880 + ... + 77121.

It is an arithmetic number, because the mean of its divisors is an integer number (3413711).

Almost surely, 2^18634121 is an apocalyptic number.

18634121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18634121 is a deficient number, since it is larger than the sum of its proper divisors (1848145).

18634121 is a wasteful number, since it uses less digits than its factorization.

18634121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154023 (or 154012 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 18634121 is about 4316.7257267517. The cubic root of 18634121 is about 265.1162229014.

The spelling of 18634121 in words is "eighteen million, six hundred thirty-four thousand, one hundred twenty-one".