3005781 has 8 divisors (see below), whose sum is σ = 4218720. Its totient is φ = 1898352.

The previous prime is 3005773. The next prime is 3005809. The reversal of 3005781 is 1875003.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3005781 - 2³ = 3005773 is a prime.

It is a super-2 number, since 2×3005781² = 18069438839922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3005701) 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, 26310 + ... + 26423.

It is an arithmetic number, because the mean of its divisors is an integer number (527340).

Almost surely, 2^3005781 is an apocalyptic number.

3005781 is the 1097-th centered pentagonal number.

It is an amenable number.

3005781 is a deficient number, since it is larger than the sum of its proper divisors (1212939).

3005781 is a wasteful number, since it uses less digits than its factorization.

3005781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52755.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 3005781 is about 1733.7188353363. The cubic root of 3005781 is about 144.3175380857.

The spelling of 3005781 in words is "three million, five thousand, seven hundred eighty-one".