1813472640 has 384 divisors, whose sum is σ = 7337977920. Its totient is φ = 404029440.

The previous prime is 1813472597. The next prime is 1813472659. The reversal of 1813472640 is 462743181.

1813472640 is a `hidden beast` number, since 1 + 8 + 1 + 3 + 4 + 7 + 2 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1813472595 and 1813472604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1652572 + ... + 1653668.

Almost surely, 2^1813472640 is an apocalyptic number.

1813472640 is a gapful number since it is divisible by the number (10) 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 1813472640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3668988960).

1813472640 is an abundant number, since it is smaller than the sum of its proper divisors (5524505280).

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

1813472640 is a wasteful number, since it uses less digits than its factorization.

1813472640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170 (or 1155 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1813472640 is about 42584.8874602247. The cubic root of 1813472640 is about 1219.4677961769.

The spelling of 1813472640 in words is "one billion, eight hundred thirteen million, four hundred seventy-two thousand, six hundred forty".