1966538 has 16 divisors (see below), whose sum is σ = 3549120. Its totient is φ = 798336.

The previous prime is 1966511. The next prime is 1966561. The reversal of 1966538 is 8356691.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3431 + ... + 3962.

It is an arithmetic number, because the mean of its divisors is an integer number (221820).

2^1966538 is an apocalyptic number.

1966538 is a deficient number, since it is larger than the sum of its proper divisors (1582582).

1966538 is a wasteful number, since it uses less digits than its factorization.

1966538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7421.

The product of its digits is 38880, while the sum is 38.

The square root of 1966538 is about 1402.3330560177. Note that the first 3 decimals coincide. The cubic root of 1966538 is about 125.2854914606.

The spelling of 1966538 in words is "one million, nine hundred sixty-six thousand, five hundred thirty-eight".