2153815 has 8 divisors (see below), whose sum is σ = 2736720. Its totient is φ = 1621632.

The previous prime is 2153813. The next prime is 2153819. The reversal of 2153815 is 5183512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2153815 - 2¹ = 2153813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2153815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12585 + ... + 12754.

It is an arithmetic number, because the mean of its divisors is an integer number (342090).

2^2153815 is an apocalyptic number.

2153815 is a deficient number, since it is larger than the sum of its proper divisors (582905).

2153815 is a wasteful number, since it uses less digits than its factorization.

2153815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25361.

The product of its digits is 1200, while the sum is 25.

The square root of 2153815 is about 1467.5881574883. The cubic root of 2153815 is about 129.1425821669.

The spelling of 2153815 in words is "two million, one hundred fifty-three thousand, eight hundred fifteen".