1812919253 has 24 divisors (see below), whose sum is σ = 2004096000. Its totient is φ = 1637653248.

The previous prime is 1812919249. The next prime is 1812919261. The reversal of 1812919253 is 3529192181.

It is not a de Polignac number, because 1812919253 - 2² = 1812919249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1812919253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812919223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1667276 + ... + 1668362.

It is an arithmetic number, because the mean of its divisors is an integer number (83504000).

Almost surely, 2^1812919253 is an apocalyptic number.

It is an amenable number.

1812919253 is a deficient number, since it is larger than the sum of its proper divisors (191176747).

1812919253 is a wasteful number, since it uses less digits than its factorization.

1812919253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349 (or 1332 counting only the distinct ones).

The product of its digits is 38880, while the sum is 41.

The square root of 1812919253 is about 42578.3895068848. The cubic root of 1812919253 is about 1219.3437420528.

The spelling of 1812919253 in words is "one billion, eight hundred twelve million, nine hundred nineteen thousand, two hundred fifty-three".