1664425 has 12 divisors (see below), whose sum is σ = 2358976. Its totient is φ = 1141200.

The previous prime is 1664417. The next prime is 1664431. The reversal of 1664425 is 5244661.

It is not a de Polignac number, because 1664425 - 2³ = 1664417 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664393 and 1664402.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4581 + ... + 4930.

2^1664425 is an apocalyptic number.

It is an amenable number.

1664425 is a deficient number, since it is larger than the sum of its proper divisors (694551).

1664425 is an equidigital number, since it uses as much as digits as its factorization.

1664425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9528 (or 9523 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 1664425 is about 1290.1259628424. The cubic root of 1664425 is about 118.5099305059.

The spelling of 1664425 in words is "one million, six hundred sixty-four thousand, four hundred twenty-five".