1809795906 has 32 divisors (see below), whose sum is σ = 4024874880. Its totient is φ = 602799408.

The previous prime is 1809795901. The next prime is 1809795919. The reversal of 1809795906 is 6095979081.

It is a super-2 number, since 2×1809795906² = 6550722442748721672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1809795901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61560 + ... + 86076.

It is an arithmetic number, because the mean of its divisors is an integer number (125777340).

Almost surely, 2^1809795906 is an apocalyptic number.

1809795906 is an abundant number, since it is smaller than the sum of its proper divisors (2215078974).

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

1809795906 is a wasteful number, since it uses less digits than its factorization.

1809795906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25895 (or 25889 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The square root of 1809795906 is about 42541.6960874857. The cubic root of 1809795906 is about 1218.6430999255.

It can be divided in two parts, 18097 and 95906, that added together give a triangular number (114003 = T₄₇₇).

The spelling of 1809795906 in words is "one billion, eight hundred nine million, seven hundred ninety-five thousand, nine hundred six".