1664925 has 24 divisors (see below), whose sum is σ = 2797440. Its totient is φ = 873600.

The previous prime is 1664909. The next prime is 1664941. The reversal of 1664925 is 5294661.

It is an interprime number because it is at equal distance from previous prime (1664909) and next prime (1664941).

It is not a de Polignac number, because 1664925 - 2⁴ = 1664909 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5785 + ... + 6065.

It is an arithmetic number, because the mean of its divisors is an integer number (116560).

2^1664925 is an apocalyptic number.

1664925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1664925 is a deficient number, since it is larger than the sum of its proper divisors (1132515).

1664925 is a wasteful number, since it uses less digits than its factorization.

1664925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 368 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 1664925 is about 1290.3197278194. The cubic root of 1664925 is about 118.5217962720.

The spelling of 1664925 in words is "one million, six hundred sixty-four thousand, nine hundred twenty-five".