1858166 has 4 divisors (see below), whose sum is σ = 2787252. Its totient is φ = 929082.

The previous prime is 1858163. The next prime is 1858169. The reversal of 1858166 is 6618581.

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

It is an interprime number because it is at equal distance from previous prime (1858163) and next prime (1858169).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1858163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 464540 + ... + 464543.

It is an arithmetic number, because the mean of its divisors is an integer number (696813).

2^1858166 is an apocalyptic number.

1858166 is a deficient number, since it is larger than the sum of its proper divisors (929086).

1858166 is an equidigital number, since it uses as much as digits as its factorization.

1858166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929085.

The product of its digits is 11520, while the sum is 35.

The square root of 1858166 is about 1363.1456268499. The cubic root of 1858166 is about 122.9404607516.

The spelling of 1858166 in words is "one million, eight hundred fifty-eight thousand, one hundred sixty-six".