1693986 has 32 divisors (see below), whose sum is σ = 3950208. Its totient is φ = 474240.

The previous prime is 1693957. The next prime is 1693987. The reversal of 1693986 is 6893961.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a d-powerful number, because it can be written as 1 + 6 + 9³ + 3⁸ + 9⁴ + 8³ + 6⁸ .

It is not an unprimeable number, because it can be changed into a prime (1693987) 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, 1846 + ... + 2606.

It is an arithmetic number, because the mean of its divisors is an integer number (123444).

2^1693986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1693986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1975104).

1693986 is an abundant number, since it is smaller than the sum of its proper divisors (2256222).

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

1693986 is a wasteful number, since it uses less digits than its factorization.

1693986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826.

The product of its digits is 69984, while the sum is 42.

The square root of 1693986 is about 1301.5321740165. The cubic root of 1693986 is about 119.2074154959.

The spelling of 1693986 in words is "one million, six hundred ninety-three thousand, nine hundred eighty-six".