2945781 has 8 divisors (see below), whose sum is σ = 4364160. Its totient is φ = 1963836.

The previous prime is 2945773. The next prime is 2945807. The reversal of 2945781 is 1875492.

It is not a de Polignac number, because 2945781 - 2³ = 2945773 is a prime.

It is a super-2 number, since 2×2945781² = 17355251399922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2945711) 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, 54525 + ... + 54578.

It is an arithmetic number, because the mean of its divisors is an integer number (545520).

2^2945781 is an apocalyptic number.

It is an amenable number.

2945781 is a deficient number, since it is larger than the sum of its proper divisors (1418379).

2945781 is a wasteful number, since it uses less digits than its factorization.

2945781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109112 (or 109106 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2945781 is about 1716.3277659002. The cubic root of 2945781 is about 143.3508103201.

The spelling of 2945781 in words is "two million, nine hundred forty-five thousand, seven hundred eighty-one".