1886661 has 12 divisors (see below), whose sum is σ = 3114592. Its totient is φ = 1078056.

The previous prime is 1886659. The next prime is 1886663. The reversal of 1886661 is 1666881.

It is an interprime number because it is at equal distance from previous prime (1886659) and next prime (1886663).

It is not a de Polignac number, because 1886661 - 2¹ = 1886659 is a prime.

It is a Duffinian number.

1886661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1886663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14911 + ... + 15036.

2^1886661 is an apocalyptic number.

It is an amenable number.

1886661 is a deficient number, since it is larger than the sum of its proper divisors (1227931).

1886661 is a wasteful number, since it uses less digits than its factorization.

1886661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29960 (or 29957 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1886661 is about 1373.5577891010. The cubic root of 1886661 is about 123.5657067019.

The spelling of 1886661 in words is "one million, eight hundred eighty-six thousand, six hundred sixty-one".