2749405 has 8 divisors (see below), whose sum is σ = 3308472. Its totient is φ = 2193408.

The previous prime is 2749391. The next prime is 2749441. The reversal of 2749405 is 5049472.

It can be written as a sum of positive squares in 4 ways, for example, as 956484 + 1792921 = 978^2 + 1339^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2749405 - 2⁷ = 2749277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2409 + ... + 3361.

It is an arithmetic number, because the mean of its divisors is an integer number (413559).

2^2749405 is an apocalyptic number.

It is an amenable number.

2749405 is a deficient number, since it is larger than the sum of its proper divisors (559067).

2749405 is an equidigital number, since it uses as much as digits as its factorization.

2749405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 2749405 is about 1658.1329862228. The cubic root of 2749405 is about 140.0918614803.

The spelling of 2749405 in words is "two million, seven hundred forty-nine thousand, four hundred five".