2129440 has 24 divisors (see below), whose sum is σ = 5031180. Its totient is φ = 851712.

The previous prime is 2129431. The next prime is 2129443. The reversal of 2129440 is 449212.

It can be written as a sum of positive squares in 2 ways, for example, as 1774224 + 355216 = 1332^2 + 596^2 .

It is an Ulam 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 3 ways as a sum of consecutive naturals, for example, 6495 + ... + 6814.

2^2129440 is an apocalyptic number.

2129440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2129440 is an abundant number, since it is smaller than the sum of its proper divisors (2901740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2129440 is a wasteful number, since it uses less digits than its factorization.

2129440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13324 (or 13316 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 2129440 is about 1459.2600864822. The cubic root of 2129440 is about 128.6535583426.

The spelling of 2129440 in words is "two million, one hundred twenty-nine thousand, four hundred forty".