2981820 has 24 divisors (see below), whose sum is σ = 8349264. Its totient is φ = 795136.

The previous prime is 2981819. The next prime is 2981827. The reversal of 2981820 is 281892.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2981827) 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, 24789 + ... + 24908.

It is an arithmetic number, because the mean of its divisors is an integer number (347886).

2^2981820 is an apocalyptic number.

2981820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2981820 is an abundant number, since it is smaller than the sum of its proper divisors (5367444).

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

2981820 is a wasteful number, since it uses less digits than its factorization.

2981820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49709 (or 49707 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 2981820 is about 1726.7947185465. The cubic root of 2981820 is about 143.9330321327.

The spelling of 2981820 in words is "two million, nine hundred eighty-one thousand, eight hundred twenty".