2643540 has 24 divisors (see below), whose sum is σ = 7402080. Its totient is φ = 704928.

The previous prime is 2643523. The next prime is 2643547. The reversal of 2643540 is 453462.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2643540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643547) 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, 21970 + ... + 22089.

It is an arithmetic number, because the mean of its divisors is an integer number (308420).

2^2643540 is an apocalyptic number.

2643540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2643540 is an abundant number, since it is smaller than the sum of its proper divisors (4758540).

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

2643540 is a wasteful number, since it uses less digits than its factorization.

2643540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44071 (or 44069 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 2643540 is about 1625.8966756839. The cubic root of 2643540 is about 138.2702120048.

The spelling of 2643540 in words is "two million, six hundred forty-three thousand, five hundred forty".