1813533456 has 80 divisors (see below), whose sum is σ = 5365720064. Its totient is φ = 517041792.

The previous prime is 1813533439. The next prime is 1813533461. The reversal of 1813533456 is 6543353181.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 158091 + ... + 169173.

Almost surely, 2^1813533456 is an apocalyptic number.

1813533456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1813533456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2682860032).

1813533456 is an abundant number, since it is smaller than the sum of its proper divisors (3552186608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1813533456 is a wasteful number, since it uses less digits than its factorization.

1813533456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11588 (or 11582 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 1813533456 is about 42585.6015103697. The cubic root of 1813533456 is about 1219.4814279099.

The spelling of 1813533456 in words is "one billion, eight hundred thirteen million, five hundred thirty-three thousand, four hundred fifty-six".