1691442 has 40 divisors (see below), whose sum is σ = 3881196. Its totient is φ = 550368.

The previous prime is 1691441. The next prime is 1691461. The reversal of 1691442 is 2441961.

It can be written as a sum of positive squares in 2 ways, for example, as 1390041 + 301401 = 1179^2 + 549^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1691441) 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, 8488 + ... + 8684.

2^1691442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1940598).

1691442 is an abundant number, since it is smaller than the sum of its proper divisors (2189754).

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

1691442 is a wasteful number, since it uses less digits than its factorization.

1691442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 255 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1691442 is about 1300.5544971281. The cubic root of 1691442 is about 119.1477110269.

The spelling of 1691442 in words is "one million, six hundred ninety-one thousand, four hundred forty-two".