2128690 has 8 divisors (see below), whose sum is σ = 3831660. Its totient is φ = 851472.

The previous prime is 2128669. The next prime is 2128697. The reversal of 2128690 is 968212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2128681 + 9 = 1459^2 + 3^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×2128690³ = 28937333839892727000, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2128697) 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, 106425 + ... + 106444.

2^2128690 is an apocalyptic number.

2128690 is a deficient number, since it is larger than the sum of its proper divisors (1702970).

2128690 is a wasteful number, since it uses less digits than its factorization.

2128690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212876.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2128690 is about 1459.0030843011. The cubic root of 2128690 is about 128.6384524150.

The spelling of 2128690 in words is "two million, one hundred twenty-eight thousand, six hundred ninety".