1664627 has 2 divisors, whose sum is σ = 1664628. Its totient is φ = 1664626.

The previous prime is 1664569. The next prime is 1664633. The reversal of 1664627 is 7264661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664627 - 2⁶ = 1664563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1664593 and 1664602.

It is not a weakly prime, because it can be changed into another prime (1664227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832313 + 832314.

It is an arithmetic number, because the mean of its divisors is an integer number (832314).

2^1664627 is an apocalyptic number.

1664627 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664627 is an equidigital number, since it uses as much as digits as its factorization.

1664627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 1664627 is about 1290.2042473965. The cubic root of 1664627 is about 118.5147245615.

The spelling of 1664627 in words is "one million, six hundred sixty-four thousand, six hundred twenty-seven".