1841805945 has 160 divisors (see below), whose sum is σ = 4103700480. Its totient is φ = 771223680.

The previous prime is 1841805941. The next prime is 1841805989. The reversal of 1841805945 is 5495081481.

It is a happy number.

1841805945 is a `hidden beast` number, since 18 + 41 + 8 + 0 + 594 + 5 = 666.

It is not a de Polignac number, because 1841805945 - 2² = 1841805941 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1841805945.

It is not an unprimeable number, because it can be changed into a prime (1841805941) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1669264 + ... + 1670366.

It is an arithmetic number, because the mean of its divisors is an integer number (25648128).

Almost surely, 2^1841805945 is an apocalyptic number.

1841805945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1841805945 is an abundant number, since it is smaller than the sum of its proper divisors (2261894535).

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

1841805945 is a wasteful number, since it uses less digits than its factorization.

1841805945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177 (or 1168 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 1841805945 is about 42916.2666712751. The cubic root of 1841805945 is about 1225.7859057967.

The spelling of 1841805945 in words is "one billion, eight hundred forty-one million, eight hundred five thousand, nine hundred forty-five".