2640426 has 16 divisors (see below), whose sum is σ = 5316384. Its totient is φ = 874224.

The previous prime is 2640409. The next prime is 2640497. The reversal of 2640426 is 6240462.

It is a super-2 number, since 2×2640426² = 13943698922952, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2640396 and 2640405.

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, 460 + ... + 2343.

It is an arithmetic number, because the mean of its divisors is an integer number (332274).

2^2640426 is an apocalyptic number.

2640426 is an abundant number, since it is smaller than the sum of its proper divisors (2675958).

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

2640426 is a wasteful number, since it uses less digits than its factorization.

2640426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2965.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 2640426 is about 1624.9387680771. The cubic root of 2640426 is about 138.2158981405.

Adding to 2640426 its reverse (6240462), we get a palindrome (8880888).

The spelling of 2640426 in words is "two million, six hundred forty thousand, four hundred twenty-six".