2115644 has 6 divisors (see below), whose sum is σ = 3702384. Its totient is φ = 1057820.

The previous prime is 2115629. The next prime is 2115653. The reversal of 2115644 is 4465112.

It is an Ulam number.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 264452 + ... + 264459.

It is an arithmetic number, because the mean of its divisors is an integer number (617064).

2^2115644 is an apocalyptic number.

It is an amenable number.

2115644 is a deficient number, since it is larger than the sum of its proper divisors (1586740).

2115644 is a wasteful number, since it uses less digits than its factorization.

2115644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528915 (or 528913 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 2115644 is about 1454.5253521338. The cubic root of 2115644 is about 128.3751202915.

The spelling of 2115644 in words is "two million, one hundred fifteen thousand, six hundred forty-four".