2636440 has 32 divisors (see below), whose sum is σ = 6246000. Its totient is φ = 998784.

The previous prime is 2636437. The next prime is 2636449. The reversal of 2636440 is 446362.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2636449) 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, 975 + ... + 2494.

2^2636440 is an apocalyptic number.

2636440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2636440 is an abundant number, since it is smaller than the sum of its proper divisors (3609560).

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

2636440 is a wasteful number, since it uses less digits than its factorization.

2636440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499 (or 3495 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 2636440 is about 1623.7117970872. The cubic root of 2636440 is about 138.1463126480.

It can be divided in two parts, 263 and 6440, that multiplied together give a triangular number (1693720 = T₁₈₄₀).

The spelling of 2636440 in words is "two million, six hundred thirty-six thousand, four hundred forty".