2045781 has 12 divisors (see below), whose sum is σ = 3083808. Its totient is φ = 1304424.

The previous prime is 2045773. The next prime is 2045789. The reversal of 2045781 is 1875402.

It is an interprime number because it is at equal distance from previous prime (2045773) and next prime (2045789).

It is not a de Polignac number, because 2045781 - 2³ = 2045773 is a prime.

It is a super-2 number, since 2×2045781² = 8370439799922, which contains 22 as substring.

2045781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4735 + ... + 5148.

It is an arithmetic number, because the mean of its divisors is an integer number (256984).

2^2045781 is an apocalyptic number.

It is an amenable number.

2045781 is a deficient number, since it is larger than the sum of its proper divisors (1038027).

2045781 is a wasteful number, since it uses less digits than its factorization.

2045781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9912 (or 9909 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 2045781 is about 1430.3080087869. The cubic root of 2045781 is about 126.9462024402.

The spelling of 2045781 in words is "two million, forty-five thousand, seven hundred eighty-one".