1891066 has 8 divisors (see below), whose sum is σ = 2844180. Its totient is φ = 943008.

The previous prime is 1891049. The next prime is 1891069. The reversal of 1891066 is 6601981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1890625 + 441 = 1375^2 + 21^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1891066² = 7152261232712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1891069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121 + ... + 1948.

2^1891066 is an apocalyptic number.

1891066 is a deficient number, since it is larger than the sum of its proper divisors (953114).

1891066 is a wasteful number, since it uses less digits than its factorization.

1891066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1891066 is about 1375.1603542860. The cubic root of 1891066 is about 123.6617995467.

Subtracting 1891066 from its reverse (6601981), we obtain a triangular number (4710915 = T₃₀₆₉).

The spelling of 1891066 in words is "one million, eight hundred ninety-one thousand, sixty-six".