2905640 has 32 divisors (see below), whose sum is σ = 6923880. Its totient is φ = 1093632.

The previous prime is 2905631. The next prime is 2905667. The reversal of 2905640 is 465092.

It can be written as a sum of positive squares in 4 ways, for example, as 2390116 + 515524 = 1546^2 + 718^2 .

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, 1457 + ... + 2816.

2^2905640 is an apocalyptic number.

2905640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2905640 is an abundant number, since it is smaller than the sum of its proper divisors (4018240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2905640 is a wasteful number, since it uses less digits than its factorization.

2905640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4301 (or 4297 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2905640 is about 1704.5937932540. The cubic root of 2905640 is about 142.6967017828.

The spelling of 2905640 in words is "two million, nine hundred five thousand, six hundred forty".