2015864 has 8 divisors (see below), whose sum is σ = 3779760. Its totient is φ = 1007928.

The previous prime is 2015863. The next prime is 2015869. The reversal of 2015864 is 4685102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125984 + ... + 125999.

It is an arithmetic number, because the mean of its divisors is an integer number (472470).

2^2015864 is an apocalyptic number.

It is an amenable number.

2015864 is a deficient number, since it is larger than the sum of its proper divisors (1763896).

2015864 is a wasteful number, since it uses less digits than its factorization.

2015864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251989 (or 251985 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2015864 is about 1419.8112550617. The cubic root of 2015864 is about 126.3243511984.

The spelling of 2015864 in words is "two million, fifteen thousand, eight hundred sixty-four".