1966881 has 16 divisors (see below), whose sum is σ = 3017600. Its totient is φ = 1116288.

The previous prime is 1966879. The next prime is 1966889. The reversal of 1966881 is 1886691.

It is not a de Polignac number, because 1966881 - 2¹ = 1966879 is a prime.

It is a super-2 number, since 2×1966881² = 7737241736322, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (20736) is a multiple of the sum of its prime divisors (648).

It is not an unprimeable number, because it can be changed into a prime (1966889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4605 + ... + 5013.

It is an arithmetic number, because the mean of its divisors is an integer number (188600).

2^1966881 is an apocalyptic number.

It is an amenable number.

1966881 is a deficient number, since it is larger than the sum of its proper divisors (1050719).

1966881 is a wasteful number, since it uses less digits than its factorization.

1966881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648.

The product of its digits is 20736, while the sum is 39.

The square root of 1966881 is about 1402.4553468827. The cubic root of 1966881 is about 125.2927750601.

The spelling of 1966881 in words is "one million, nine hundred sixty-six thousand, eight hundred eighty-one".