1664807 has 2 divisors, whose sum is σ = 1664808. Its totient is φ = 1664806.

The previous prime is 1664801. The next prime is 1664821. The reversal of 1664807 is 7084661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1664807 - 2¹⁶ = 1599271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832403 + 832404.

It is an arithmetic number, because the mean of its divisors is an integer number (832404).

2^1664807 is an apocalyptic number.

1664807 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664807 is an equidigital number, since it uses as much as digits as its factorization.

1664807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 1664807 is about 1290.2740019081. The cubic root of 1664807 is about 118.5189961654.

The spelling of 1664807 in words is "one million, six hundred sixty-four thousand, eight hundred seven".