2691240 has 64 divisors (see below), whose sum is σ = 8285760. Its totient is φ = 698880.

The previous prime is 2691239. The next prime is 2691251. The reversal of 2691240 is 421962.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 2691240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4647 + ... + 5193.

It is an arithmetic number, because the mean of its divisors is an integer number (129465).

2^2691240 is an apocalyptic number.

2691240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is a pronic number, being equal to 1640×1641.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2691240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4142880).

2691240 is an abundant number, since it is smaller than the sum of its proper divisors (5594520).

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

2691240 is a wasteful number, since it uses less digits than its factorization.

2691240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 2691240 is about 1640.4999238037. The cubic root of 2691240 is about 139.0969080788.

The spelling of 2691240 in words is "two million, six hundred ninety-one thousand, two hundred forty".