2489640 has 32 divisors (see below), whose sum is σ = 7469280. Its totient is φ = 663872.

The previous prime is 2489639. The next prime is 2489647. The reversal of 2489640 is 469842.

It is not an unprimeable number, because it can be changed into a prime (2489647) 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, 10254 + ... + 10493.

It is an arithmetic number, because the mean of its divisors is an integer number (233415).

2^2489640 is an apocalyptic number.

2489640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2489640 is an abundant number, since it is smaller than the sum of its proper divisors (4979640).

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

2489640 is a wasteful number, since it uses less digits than its factorization.

2489640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20761 (or 20757 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 2489640 is about 1577.8593093175. The cubic root of 2489640 is about 135.5331454886.

The spelling of 2489640 in words is "two million, four hundred eighty-nine thousand, six hundred forty".