1906866 has 48 divisors (see below), whose sum is σ = 4619160. Its totient is φ = 564480.

The previous prime is 1906843. The next prime is 1906867. The reversal of 1906866 is 6686091.

It can be written as a sum of positive squares in 4 ways, for example, as 1490841 + 416025 = 1221^2 + 645^2 .

It is a super-2 number, since 2×1906866² = 7272275883912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1906866.

It is not an unprimeable number, because it can be changed into a prime (1906867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6646 + ... + 6926.

2^1906866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1906866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2309580).

1906866 is an abundant number, since it is smaller than the sum of its proper divisors (2712294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1906866 is a wasteful number, since it uses less digits than its factorization.

1906866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1906866 is about 1380.8931892076. The cubic root of 1906866 is about 124.0052460493.

It can be divided in two parts, 1906 and 866, that added together give a palindrome (2772).

The spelling of 1906866 in words is "one million, nine hundred six thousand, eight hundred sixty-six".