1809995040 has 144 divisors (see below), whose sum is σ = 7059019968. Its totient is φ = 413710848.

The previous prime is 1809995023. The next prime is 1809995063. The reversal of 1809995040 is 405999081.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79702 + ... + 99861.

It is an arithmetic number, because the mean of its divisors is an integer number (49020972).

Almost surely, 2^1809995040 is an apocalyptic number.

1809995040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1809995040 is an abundant number, since it is smaller than the sum of its proper divisors (5249024928).

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

1809995040 is a wasteful number, since it uses less digits than its factorization.

1809995040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179591 (or 179580 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 1809995040 is about 42544.0364798640. The cubic root of 1809995040 is about 1218.6877945371.

The spelling of 1809995040 in words is "one billion, eight hundred nine million, nine hundred ninety-five thousand, forty".