2129724 has 18 divisors (see below), whose sum is σ = 5383560. Its totient is φ = 709896.

The previous prime is 2129719. The next prime is 2129741. The reversal of 2129724 is 4279212.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29544 + ... + 29615.

2^2129724 is an apocalyptic number.

It is an amenable number.

2129724 is an abundant number, since it is smaller than the sum of its proper divisors (3253836).

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

2129724 is a wasteful number, since it uses less digits than its factorization.

2129724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59169 (or 59164 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 2129724 is about 1459.3573928274. The cubic root of 2129724 is about 128.6592775279.

It can be divided in two parts, 21297 and 24, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 2129724 in words is "two million, one hundred twenty-nine thousand, seven hundred twenty-four".