1966518 has 40 divisors (see below), whose sum is σ = 4501200. Its totient is φ = 641520.

The previous prime is 1966511. The next prime is 1966561. The reversal of 1966518 is 8156691.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966511) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9783 + ... + 9981.

It is an arithmetic number, because the mean of its divisors is an integer number (112530).

2^1966518 is an apocalyptic number.

1966518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1966518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2250600).

1966518 is an abundant number, since it is smaller than the sum of its proper divisors (2534682).

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

1966518 is a wasteful number, since it uses less digits than its factorization.

1966518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 265 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1966518 is about 1402.3259250260. The cubic root of 1966518 is about 125.2850667348.

It can be divided in two parts, 19665 and 18, that added together give a 9-th power (19683 = 3⁹).

The spelling of 1966518 in words is "one million, nine hundred sixty-six thousand, five hundred eighteen".