2019864 has 64 divisors (see below), whose sum is σ = 6301440. Its totient is φ = 524160.

The previous prime is 2019859. The next prime is 2019869. The reversal of 2019864 is 4689102.

It is an interprime number because it is at equal distance from previous prime (2019859) and next prime (2019869).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2019869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1302 + ... + 2394.

It is an arithmetic number, because the mean of its divisors is an integer number (98460).

2^2019864 is an apocalyptic number.

2019864 is a gapful number since it is divisible by the number (24) 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 2019864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3150720).

2019864 is an abundant number, since it is smaller than the sum of its proper divisors (4281576).

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

2019864 is a wasteful number, since it uses less digits than its factorization.

2019864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120 (or 1116 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 2019864 is about 1421.2191949168. The cubic root of 2019864 is about 126.4078494832.

The spelling of 2019864 in words is "two million, nineteen thousand, eight hundred sixty-four".