1816540044 has 24 divisors (see below), whose sum is σ = 4623920448. Its totient is φ = 550466640.

The previous prime is 1816540043. The next prime is 1816540051. The reversal of 1816540044 is 4400456181.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 1816539987 and 1816540014.

It is not an unprimeable number, because it can be changed into a prime (1816540043) 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, 6880702 + ... + 6880965.

It is an arithmetic number, because the mean of its divisors is an integer number (192663352).

Almost surely, 2^1816540044 is an apocalyptic number.

It is an amenable number.

1816540044 is an abundant number, since it is smaller than the sum of its proper divisors (2807380404).

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

1816540044 is a wasteful number, since it uses less digits than its factorization.

1816540044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13761685 (or 13761683 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 1816540044 is about 42620.8874145060. The cubic root of 1816540044 is about 1220.1549664299.

The spelling of 1816540044 in words is "one billion, eight hundred sixteen million, five hundred forty thousand, forty-four".