2123915 has 16 divisors (see below), whose sum is σ = 2726400. Its totient is φ = 1583712.

The previous prime is 2123909. The next prime is 2123917. The reversal of 2123915 is 5193212.

It is a cyclic number.

It is not a de Polignac number, because 2123915 - 2⁶ = 2123851 is a prime.

It is a super-2 number, since 2×2123915² = 9022029854450, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁹ + 1 + 2²¹ + 3⁹ + 9⁴ + 1 + 5 .

It is not an unprimeable number, because it can be changed into a prime (2123917) 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, 7364 + ... + 7646.

It is an arithmetic number, because the mean of its divisors is an integer number (170400).

2^2123915 is an apocalyptic number.

2123915 is a deficient number, since it is larger than the sum of its proper divisors (602485).

2123915 is a wasteful number, since it uses less digits than its factorization.

2123915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386.

The product of its digits is 540, while the sum is 23.

The square root of 2123915 is about 1457.3657742653. The cubic root of 2123915 is about 128.5421947056.

The spelling of 2123915 in words is "two million, one hundred twenty-three thousand, nine hundred fifteen".