2051858 has 4 divisors (see below), whose sum is σ = 3077790. Its totient is φ = 1025928.

The previous prime is 2051851. The next prime is 2051887. The reversal of 2051858 is 8581502.

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., 1646089 + 405769 = 1283^2 + 637^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2051858.

It is not an unprimeable number, because it can be changed into a prime (2051851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512963 + ... + 512966.

2^2051858 is an apocalyptic number.

2051858 is a deficient number, since it is larger than the sum of its proper divisors (1025932).

2051858 is a wasteful number, since it uses less digits than its factorization.

2051858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025931.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 2051858 is about 1432.4308011209. The cubic root of 2051858 is about 127.0717762371.

The spelling of 2051858 in words is "two million, fifty-one thousand, eight hundred fifty-eight".