2391840 has 144 divisors (see below), whose sum is σ = 8963136. Its totient is φ = 576000.

The previous prime is 2391827. The next prime is 2391847. The reversal of 2391840 is 481932.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nialpdrome in base 12.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2391847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15765 + ... + 15915.

It is an arithmetic number, because the mean of its divisors is an integer number (62244).

2^2391840 is an apocalyptic number.

2391840 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 2391840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4481568).

2391840 is an abundant number, since it is smaller than the sum of its proper divisors (6571296).

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

2391840 is a wasteful number, since it uses less digits than its factorization.

2391840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2391840 is about 1546.5574674095. The cubic root of 2391840 is about 133.7346795856.

The spelling of 2391840 in words is "two million, three hundred ninety-one thousand, eight hundred forty".