1669040 has 40 divisors (see below), whose sum is σ = 4011648. Its totient is φ = 645120.

The previous prime is 1669027. The next prime is 1669049. The reversal of 1669040 is 409661.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1669049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2144 + ... + 2816.

2^1669040 is an apocalyptic number.

1669040 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 1669040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2005824).

1669040 is an abundant number, since it is smaller than the sum of its proper divisors (2342608).

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

1669040 is a wasteful number, since it uses less digits than its factorization.

1669040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1669040 is about 1291.9133097851. The cubic root of 1669040 is about 118.6193614138.

The spelling of 1669040 in words is "one million, six hundred sixty-nine thousand, forty".