2987840 has 28 divisors (see below), whose sum is σ = 7115556. Its totient is φ = 1195008.

The previous prime is 2987839. The next prime is 2987843. The reversal of 2987840 is 487892.

It can be written as a sum of positive squares in 2 ways, for example, as 2096704 + 891136 = 1448^2 + 944^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2987794 and 2987803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2987843) 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, 4349 + ... + 4988.

It is an arithmetic number, because the mean of its divisors is an integer number (254127).

2^2987840 is an apocalyptic number.

2987840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2987840 is an abundant number, since it is smaller than the sum of its proper divisors (4127716).

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

2987840 is an equidigital number, since it uses as much as digits as its factorization.

2987840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9354 (or 9344 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 2987840 is about 1728.5369536113. The cubic root of 2987840 is about 144.0298292115.

The spelling of 2987840 in words is "two million, nine hundred eighty-seven thousand, eight hundred forty".