2840749 has 4 divisors (see below), whose sum is σ = 2917564. Its totient is φ = 2763936.

The previous prime is 2840741. The next prime is 2840759. The reversal of 2840749 is 9470482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1483524 + 1357225 = 1218^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2840749 - 2³ = 2840741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38352 + ... + 38425.

It is an arithmetic number, because the mean of its divisors is an integer number (729391).

2^2840749 is an apocalyptic number.

It is an amenable number.

2840749 is a deficient number, since it is larger than the sum of its proper divisors (76815).

2840749 is an equidigital number, since it uses as much as digits as its factorization.

2840749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76814.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 2840749 is about 1685.4521648507. The cubic root of 2840749 is about 141.6264233250.

The spelling of 2840749 in words is "two million, eight hundred forty thousand, seven hundred forty-nine".