2128724 has 36 divisors (see below), whose sum is σ = 4181184. Its totient is φ = 947232.

The previous prime is 2128697. The next prime is 2128727. The reversal of 2128724 is 4278212.

2128724 = T₁₀₇ + T₁₀₈ + ... + T₂₄₀.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 2128693 and 2128702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31739 + ... + 31805.

It is an arithmetic number, because the mean of its divisors is an integer number (116144).

2^2128724 is an apocalyptic number.

It is an amenable number.

2128724 is a deficient number, since it is larger than the sum of its proper divisors (2052460).

2128724 is a wasteful number, since it uses less digits than its factorization.

2128724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 129 counting only the distinct ones).

The product of its digits is 1792, while the sum is 26.

The square root of 2128724 is about 1459.0147360462. The cubic root of 2128724 is about 128.6391372938.

The spelling of 2128724 in words is "two million, one hundred twenty-eight thousand, seven hundred twenty-four".