1986394 has 4 divisors (see below), whose sum is σ = 2979594. Its totient is φ = 993196.

The previous prime is 1986373. The next prime is 1986401. The reversal of 1986394 is 4936891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1404225 + 582169 = 1185^2 + 763^2 .

It is a super-2 number, since 2×1986394² = 7891522246472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496597 + ... + 496600.

2^1986394 is an apocalyptic number.

1986394 is a deficient number, since it is larger than the sum of its proper divisors (993200).

1986394 is an equidigital number, since it uses as much as digits as its factorization.

1986394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993199.

The product of its digits is 46656, while the sum is 40.

The square root of 1986394 is about 1409.3949056244. The cubic root of 1986394 is about 125.7057465422.

The spelling of 1986394 in words is "one million, nine hundred eighty-six thousand, three hundred ninety-four".