1813280540 has 24 divisors (see below), whose sum is σ = 3824673552. Its totient is φ = 722115200.

The previous prime is 1813280533. The next prime is 1813280549. The reversal of 1813280540 is 450823181.

It is a junction number, because it is equal to n+sod(n) for n = 1813280497 and 1813280506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813280549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195161 + ... + 204240.

It is an arithmetic number, because the mean of its divisors is an integer number (159361398).

Almost surely, 2^1813280540 is an apocalyptic number.

1813280540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1813280540 is an abundant number, since it is smaller than the sum of its proper divisors (2011393012).

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

1813280540 is a wasteful number, since it uses less digits than its factorization.

1813280540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399637 (or 399635 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1813280540 is about 42582.6319055081. The cubic root of 1813280540 is about 1219.4247355078.

The spelling of 1813280540 in words is "one billion, eight hundred thirteen million, two hundred eighty thousand, five hundred forty".