1669442 has 4 divisors (see below), whose sum is σ = 2504166. Its totient is φ = 834720.

The previous prime is 1669441. The next prime is 1669453. The reversal of 1669442 is 2449661.

It is a happy number.

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., 1661521 + 7921 = 1289^2 + 89^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1669399 and 1669408.

It is not an unprimeable number, because it can be changed into a prime (1669441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417359 + ... + 417362.

2^1669442 is an apocalyptic number.

1669442 is a deficient number, since it is larger than the sum of its proper divisors (834724).

1669442 is an equidigital number, since it uses as much as digits as its factorization.

1669442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834723.

The product of its digits is 10368, while the sum is 32.

The square root of 1669442 is about 1292.0688836126. The cubic root of 1669442 is about 118.6288840846.

The spelling of 1669442 in words is "one million, six hundred sixty-nine thousand, four hundred forty-two".