2540686 has 4 divisors (see below), whose sum is σ = 3811032. Its totient is φ = 1270342.

The previous prime is 2540677. The next prime is 2540687. The reversal of 2540686 is 6860452.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635170 + ... + 635173.

It is an arithmetic number, because the mean of its divisors is an integer number (952758).

2^2540686 is an apocalyptic number.

2540686 is a deficient number, since it is larger than the sum of its proper divisors (1270346).

2540686 is a wasteful number, since it uses less digits than its factorization.

2540686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270345.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 2540686 is about 1593.9529478626. The cubic root of 2540686 is about 136.4531811326.

The spelling of 2540686 in words is "two million, five hundred forty thousand, six hundred eighty-six".