2389840 has 20 divisors (see below), whose sum is σ = 5556564. Its totient is φ = 955904.

The previous prime is 2389831. The next prime is 2389841. The reversal of 2389840 is 489832.

It can be written as a sum of positive squares in 2 ways, for example, as 1710864 + 678976 = 1308^2 + 824^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×2389840² = 11422670451200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2389796 and 2389805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2389841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14857 + ... + 15016.

2^2389840 is an apocalyptic number.

2389840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2389840 is an abundant number, since it is smaller than the sum of its proper divisors (3166724).

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

2389840 is a wasteful number, since it uses less digits than its factorization.

2389840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29886 (or 29880 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 2389840 is about 1545.9107348097. The cubic root of 2389840 is about 133.6973939332.

The spelling of 2389840 in words is "two million, three hundred eighty-nine thousand, eight hundred forty".