2691440 has 40 divisors (see below), whose sum is σ = 6629040. Its totient is φ = 1012736.

The previous prime is 2691439. The next prime is 2691443. The reversal of 2691440 is 441962.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691443) 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, 371 + ... + 2349.

It is an arithmetic number, because the mean of its divisors is an integer number (165726).

2^2691440 is an apocalyptic number.

2691440 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 2691440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3314520).

2691440 is an abundant number, since it is smaller than the sum of its proper divisors (3937600).

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

2691440 is a wasteful number, since it uses less digits than its factorization.

2691440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009 (or 2003 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2691440 is about 1640.5608796994. The cubic root of 2691440 is about 139.1003536643.

The spelling of 2691440 in words is "two million, six hundred ninety-one thousand, four hundred forty".