1669842 has 48 divisors (see below), whose sum is σ = 3978720. Its totient is φ = 518976.

The previous prime is 1669817. The next prime is 1669861. The reversal of 1669842 is 2489661.

It is a junction number, because it is equal to n+sod(n) for n = 1669797 and 1669806.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15553 + ... + 15659.

It is an arithmetic number, because the mean of its divisors is an integer number (82890).

2^1669842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989360).

1669842 is an abundant number, since it is smaller than the sum of its proper divisors (2308878).

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

1669842 is a wasteful number, since it uses less digits than its factorization.

1669842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 129 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1669842 is about 1292.2236648506. The cubic root of 1669842 is about 118.6383578617.

Adding to 1669842 its sum of digits (36), we get a triangular number (1669878 = T₁₈₂₇).

The spelling of 1669842 in words is "one million, six hundred sixty-nine thousand, eight hundred forty-two".