2158905 has 32 divisors (see below), whose sum is σ = 4089600. Its totient is φ = 951552.

The previous prime is 2158903. The next prime is 2158909. The reversal of 2158905 is 5098512.

It is not a de Polignac number, because 2158905 - 2¹ = 2158903 is a prime.

It is a Curzon number.

2158905 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2691 + ... + 3399.

It is an arithmetic number, because the mean of its divisors is an integer number (127800).

2^2158905 is an apocalyptic number.

It is an amenable number.

2158905 is a deficient number, since it is larger than the sum of its proper divisors (1930695).

2158905 is a wasteful number, since it uses less digits than its factorization.

2158905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 2158905 is about 1469.3212718803. The cubic root of 2158905 is about 129.2442341358.

The spelling of 2158905 in words is "two million, one hundred fifty-eight thousand, nine hundred five".