1896661 has 4 divisors (see below), whose sum is σ = 2042572. Its totient is φ = 1750752.

The previous prime is 1896659. The next prime is 1896667. The reversal of 1896661 is 1666981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1666981 = 43 ⋅38767.

It can be written as a sum of positive squares in 2 ways, for example, as 442225 + 1454436 = 665^2 + 1206^2 .

It is a cyclic number.

It is not a de Polignac number, because 1896661 - 2¹ = 1896659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1896661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1896667) 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, 72936 + ... + 72961.

It is an arithmetic number, because the mean of its divisors is an integer number (510643).

2^1896661 is an apocalyptic number.

It is an amenable number.

1896661 is a deficient number, since it is larger than the sum of its proper divisors (145911).

1896661 is a wasteful number, since it uses less digits than its factorization.

1896661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145910.

The product of its digits is 15552, while the sum is 37.

The square root of 1896661 is about 1377.1931600179. The cubic root of 1896661 is about 123.7836367428.

The spelling of 1896661 in words is "one million, eight hundred ninety-six thousand, six hundred sixty-one".