18121453 has 24 divisors (see below), whose sum is σ = 22331904. Its totient is φ = 14385600.

The previous prime is 18121429. The next prime is 18121463. The reversal of 18121453 is 35412181.

It is not a de Polignac number, because 18121453 - 2¹⁷ = 17990381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18121463) 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 23 ways as a sum of consecutive naturals, for example, 297043 + ... + 297103.

It is an arithmetic number, because the mean of its divisors is an integer number (930496).

Almost surely, 2^18121453 is an apocalyptic number.

It is an amenable number.

18121453 is a deficient number, since it is larger than the sum of its proper divisors (4210451).

18121453 is an equidigital number, since it uses as much as digits as its factorization.

18121453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 136 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 18121453 is about 4256.9299970754. The cubic root of 18121453 is about 262.6622573562.

The spelling of 18121453 in words is "eighteen million, one hundred twenty-one thousand, four hundred fifty-three".