2989440 has 128 divisors (see below), whose sum is σ = 10648800. Its totient is φ = 792576.

The previous prime is 2989429. The next prime is 2989447. The reversal of 2989440 is 449892.

It is a happy number.

It is a Cunningham number, because it is equal to 1729²-1.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2989395 and 2989404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2989447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17194 + ... + 17366.

2^2989440 is an apocalyptic number.

2989440 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 2989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5324400).

2989440 is an abundant number, since it is smaller than the sum of its proper divisors (7659360).

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

2989440 is a wasteful number, since it uses less digits than its factorization.

2989440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 2989440 is about 1728.9997108155. Note that the first 3 decimals coincide. The cubic root of 2989440 is about 144.0555341359.

The spelling of 2989440 in words is "two million, nine hundred eighty-nine thousand, four hundred forty".