1669725 has 36 divisors (see below), whose sum is σ = 3080532. Its totient is φ = 864000.

The previous prime is 1669697. The next prime is 1669727. The reversal of 1669725 is 5279661.

It can be written as a sum of positive squares in 6 ways, for example, as 799236 + 870489 = 894^2 + 933^2 .

It is not a de Polignac number, because 1669725 - 2⁷ = 1669597 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1669725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9135 + ... + 9315.

2^1669725 is an apocalyptic number.

1669725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1669725 is a deficient number, since it is larger than the sum of its proper divisors (1410807).

1669725 is a wasteful number, since it uses less digits than its factorization.

1669725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 230 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 1669725 is about 1292.1783932569. The cubic root of 1669725 is about 118.6355869385.

The spelling of 1669725 in words is "one million, six hundred sixty-nine thousand, seven hundred twenty-five".