1669240 has 32 divisors (see below), whose sum is σ = 3888000. Its totient is φ = 644224.

The previous prime is 1669237. The next prime is 1669243. The reversal of 1669240 is 429661.

It is an interprime number because it is at equal distance from previous prime (1669237) and next prime (1669243).

It is a junction number, because it is equal to n+sod(n) for n = 1669199 and 1669208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (121500).

2^1669240 is an apocalyptic number.

1669240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944000).

1669240 is an abundant number, since it is smaller than the sum of its proper divisors (2218760).

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

1669240 is a wasteful number, since it uses less digits than its factorization.

1669240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1669240 is about 1291.9907120409. The cubic root of 1669240 is about 118.6240992521.

The spelling of 1669240 in words is "one million, six hundred sixty-nine thousand, two hundred forty".