1866842 has 4 divisors (see below), whose sum is σ = 2800266. Its totient is φ = 933420.

The previous prime is 1866833. The next prime is 1866847. The reversal of 1866842 is 2486681.

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., 1745041 + 121801 = 1321^2 + 349^2 .

It is not an unprimeable number, because it can be changed into a prime (1866847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 466709 + ... + 466712.

2^1866842 is an apocalyptic number.

1866842 is a deficient number, since it is larger than the sum of its proper divisors (933424).

1866842 is an equidigital number, since it uses as much as digits as its factorization.

1866842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933423.

The product of its digits is 18432, while the sum is 35.

The square root of 1866842 is about 1366.3242660511. The cubic root of 1866842 is about 123.1315049773.

The spelling of 1866842 in words is "one million, eight hundred sixty-six thousand, eight hundred forty-two".