2745405 has 54 divisors (see below), whose sum is σ = 5438394. Its totient is φ = 1280448.

The previous prime is 2745397. The next prime is 2745419. The reversal of 2745405 is 5045472.

It can be written as a sum of positive squares in 3 ways, for example, as 12996 + 2732409 = 114^2 + 1653^2 .

It is not a de Polignac number, because 2745405 - 2³ = 2745397 is a prime.

It is a super-2 number, since 2×2745405² = 15074497228050, which contains 22 as substring.

It is a Curzon number.

2745405 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 144486 + ... + 144504.

It is an arithmetic number, because the mean of its divisors is an integer number (100711).

2^2745405 is an apocalyptic number.

It is an amenable number.

2745405 is a deficient number, since it is larger than the sum of its proper divisors (2692989).

2745405 is a wasteful number, since it uses less digits than its factorization.

2745405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 2745405 is about 1656.9263713273. The cubic root of 2745405 is about 140.0238904808.

The spelling of 2745405 in words is "two million, seven hundred forty-five thousand, four hundred five".