2540690 has 16 divisors (see below), whose sum is σ = 4731480. Its totient is φ = 981120.

The previous prime is 2540689. The next prime is 2540693. The reversal of 2540690 is 960452.

It can be written as a sum of positive squares in 4 ways, for example, as 1485961 + 1054729 = 1219^2 + 1027^2 .

It is a super-2 number, since 2×2540690² = 12910211352200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2540693) 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, 4091 + ... + 4670.

2^2540690 is an apocalyptic number.

2540690 is a deficient number, since it is larger than the sum of its proper divisors (2190790).

2540690 is a wasteful number, since it uses less digits than its factorization.

2540690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8797.

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

The square root of 2540690 is about 1593.9542026043. The cubic root of 2540690 is about 136.4532527422.

The spelling of 2540690 in words is "two million, five hundred forty thousand, six hundred ninety".