2135890 has 8 divisors (see below), whose sum is σ = 3844620. Its totient is φ = 854352.

The previous prime is 2135857. The next prime is 2135891. The reversal of 2135890 is 985312.

It can be written as a sum of positive squares in 2 ways, for example, as 2134521 + 1369 = 1461^2 + 37^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2135891) 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, 106785 + ... + 106804.

2^2135890 is an apocalyptic number.

2135890 is a deficient number, since it is larger than the sum of its proper divisors (1708730).

2135890 is a wasteful number, since it uses less digits than its factorization.

2135890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213596.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2135890 is about 1461.4684396182. The cubic root of 2135890 is about 128.7833231369.

It can be divided in two parts, 2135 and 890, that added together give a square (3025 = 55²).

The spelling of 2135890 in words is "two million, one hundred thirty-five thousand, eight hundred ninety".