1669429 has 4 divisors (see below), whose sum is σ = 1686060. Its totient is φ = 1652800.

The previous prime is 1669427. The next prime is 1669433. The reversal of 1669429 is 9249661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1562500 + 106929 = 1250^2 + 327^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669429 - 2¹ = 1669427 is a prime.

It is a Duffinian number.

1669429 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8164 + ... + 8365.

It is an arithmetic number, because the mean of its divisors is an integer number (421515).

2^1669429 is an apocalyptic number.

It is an amenable number.

1669429 is a deficient number, since it is larger than the sum of its proper divisors (16631).

1669429 is a wasteful number, since it uses less digits than its factorization.

1669429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16630.

The product of its digits is 23328, while the sum is 37.

The square root of 1669429 is about 1292.0638529113. The cubic root of 1669429 is about 118.6285761614.

The spelling of 1669429 in words is "one million, six hundred sixty-nine thousand, four hundred twenty-nine".