2129445 has 24 divisors (see below), whose sum is σ = 3744000. Its totient is φ = 1119456.

The previous prime is 2129443. The next prime is 2129447. The reversal of 2129445 is 5449212.

2129445 is a `hidden beast` number, since 212 + 9 + 445 = 666.

It is an interprime number because it is at equal distance from previous prime (2129443) and next prime (2129447).

It is not a de Polignac number, because 2129445 - 2¹ = 2129443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3256 + ... + 3854.

It is an arithmetic number, because the mean of its divisors is an integer number (156000).

2^2129445 is an apocalyptic number.

It is an amenable number.

2129445 is a deficient number, since it is larger than the sum of its proper divisors (1614555).

2129445 is a wasteful number, since it uses less digits than its factorization.

2129445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 686 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2129445 is about 1459.2617996782. The cubic root of 2129445 is about 128.6536590368.

The spelling of 2129445 in words is "two million, one hundred twenty-nine thousand, four hundred forty-five".