2128642 has 4 divisors (see below), whose sum is σ = 3192966. Its totient is φ = 1064320.

The previous prime is 2128631. The next prime is 2128649. The reversal of 2128642 is 2468212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1879641 + 249001 = 1371^2 + 499^2 .

It is a super-2 number, since 2×2128642² = 9062233528328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2128649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532159 + ... + 532162.

2^2128642 is an apocalyptic number.

2128642 is a deficient number, since it is larger than the sum of its proper divisors (1064324).

2128642 is a wasteful number, since it uses less digits than its factorization.

2128642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064323.

The product of its digits is 1536, while the sum is 25.

The square root of 2128642 is about 1458.9866346201. The cubic root of 2128642 is about 128.6374855148.

The spelling of 2128642 in words is "two million, one hundred twenty-eight thousand, six hundred forty-two".