2643740 has 48 divisors (see below), whose sum is σ = 6187104. Its totient is φ = 940800.

The previous prime is 2643737. The next prime is 2643743. The reversal of 2643740 is 473462.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2643737) and next prime (2643743).

It is a super-2 number, since 2×2643740² = 13978722375200, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁹ + 6³ + 4³ + 3¹³ + 7² + 4¹⁰ + 0 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643743) 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, 13322 + ... + 13518.

It is an arithmetic number, because the mean of its divisors is an integer number (128898).

2^2643740 is an apocalyptic number.

2643740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2643740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3093552).

2643740 is an abundant number, since it is smaller than the sum of its proper divisors (3543364).

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

2643740 is a wasteful number, since it uses less digits than its factorization.

2643740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 2643740 is about 1625.9581790440. The cubic root of 2643740 is about 138.2736989131.

It can be divided in two parts, 264 and 3740, that added together give a palindrome (4004).

The spelling of 2643740 in words is "two million, six hundred forty-three thousand, seven hundred forty".