2861040 has 160 divisors (see below), whose sum is σ = 10999296. Its totient is φ = 599040.

The previous prime is 2861009. The next prime is 2861041. The reversal of 2861040 is 401682.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 2860998 and 2861016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21775 + ... + 21905.

2^2861040 is an apocalyptic number.

2861040 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 2861040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5499648).

2861040 is an abundant number, since it is smaller than the sum of its proper divisors (8138256).

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

2861040 is a wasteful number, since it uses less digits than its factorization.

2861040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 2861040 is about 1691.4609070268. The cubic root of 2861040 is about 141.9628283316.

It can be divided in two parts, 286 and 1040, that added together give a triangular number (1326 = T₅₁).

The spelling of 2861040 in words is "two million, eight hundred sixty-one thousand, forty".