2987820 has 96 divisors (see below), whose sum is σ = 10160640. Its totient is φ = 722880.

The previous prime is 2987791. The next prime is 2987821. The reversal of 2987820 is 287892.

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

It is not an unprimeable number, because it can be changed into a prime (2987821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5689 + ... + 6191.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2^2987820 is an apocalyptic number.

2987820 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 2987820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5080320).

2987820 is an abundant number, since it is smaller than the sum of its proper divisors (7172820).

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

2987820 is a wasteful number, since it uses less digits than its factorization.

2987820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 2987820 is about 1728.5311683623. The cubic root of 2987820 is about 144.0295078419.

It can be divided in two parts, 298 and 7820, that added together give a palindrome (8118).

The spelling of 2987820 in words is "two million, nine hundred eighty-seven thousand, eight hundred twenty".