2869820 has 48 divisors (see below), whose sum is σ = 6386688. Its totient is φ = 1081920.

The previous prime is 2869813. The next prime is 2869837. The reversal of 2869820 is 289682.

2869820 = 165² + 166² + ... + 235².

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40385 + ... + 40455.

It is an arithmetic number, because the mean of its divisors is an integer number (133056).

2^2869820 is an apocalyptic number.

2869820 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 2869820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3193344).

2869820 is an abundant number, since it is smaller than the sum of its proper divisors (3516868).

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

2869820 is a wasteful number, since it uses less digits than its factorization.

2869820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 2869820 is about 1694.0543084565. The cubic root of 2869820 is about 142.1078992123.

The spelling of 2869820 in words is "two million, eight hundred sixty-nine thousand, eight hundred twenty".