1821297453 has 8 divisors (see below), whose sum is σ = 2429072448. Its totient is φ = 1213860384.

The previous prime is 1821297433. The next prime is 1821297479. The reversal of 1821297453 is 3547921281.

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

It is not a de Polignac number, because 1821297453 - 2⁸ = 1821297197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821297433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71625 + ... + 93662.

It is an arithmetic number, because the mean of its divisors is an integer number (303634056).

Almost surely, 2^1821297453 is an apocalyptic number.

It is an amenable number.

1821297453 is a deficient number, since it is larger than the sum of its proper divisors (607774995).

1821297453 is a wasteful number, since it uses less digits than its factorization.

1821297453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168963.

The product of its digits is 120960, while the sum is 42.

The square root of 1821297453 is about 42676.6616899682. The cubic root of 1821297453 is about 1221.2192087046.

The spelling of 1821297453 in words is "one billion, eight hundred twenty-one million, two hundred ninety-seven thousand, four hundred fifty-three".