1866346 has 4 divisors (see below), whose sum is σ = 2799522. Its totient is φ = 933172.

The previous prime is 1866343. The next prime is 1866349. The reversal of 1866346 is 6436681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6436681 = 167 ⋅38543.

It is an interprime number because it is at equal distance from previous prime (1866343) and next prime (1866349).

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 632025 = 1111^2 + 795^2 .

It is not an unprimeable number, because it can be changed into a prime (1866341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 466585 + ... + 466588.

2^1866346 is an apocalyptic number.

1866346 is a deficient number, since it is larger than the sum of its proper divisors (933176).

1866346 is an equidigital number, since it uses as much as digits as its factorization.

1866346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933175.

The product of its digits is 20736, while the sum is 34.

The square root of 1866346 is about 1366.1427451039. The cubic root of 1866346 is about 123.1205991023.

The spelling of 1866346 in words is "one million, eight hundred sixty-six thousand, three hundred forty-six".