2540406 has 32 divisors (see below), whose sum is σ = 5642496. Its totient is φ = 756000.

The previous prime is 2540393. The next prime is 2540407. The reversal of 2540406 is 6040452.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3711 + ... + 4341.

It is an arithmetic number, because the mean of its divisors is an integer number (176328).

2^2540406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2540406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2821248).

2540406 is an abundant number, since it is smaller than the sum of its proper divisors (3102090).

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

2540406 is a wasteful number, since it uses less digits than its factorization.

2540406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 2540406 is about 1593.8651134898. The cubic root of 2540406 is about 136.4481682747.

Adding to 2540406 its reverse (6040452), we get a palindrome (8580858).

The spelling of 2540406 in words is "two million, five hundred forty thousand, four hundred six".