1664654 has 4 divisors (see below), whose sum is σ = 2496984. Its totient is φ = 832326.

The previous prime is 1664653. The next prime is 1664681. The reversal of 1664654 is 4564661.

It is a semiprime because it is the product of two primes.

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 1664654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664651) by changing a digit.

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 as a sum of consecutive naturals, namely, 416162 + ... + 416165.

It is an arithmetic number, because the mean of its divisors is an integer number (624246).

2^1664654 is an apocalyptic number.

1664654 is a deficient number, since it is larger than the sum of its proper divisors (832330).

1664654 is an equidigital number, since it uses as much as digits as its factorization.

1664654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832329.

The product of its digits is 17280, while the sum is 32.

The square root of 1664654 is about 1290.2147108137. The cubic root of 1664654 is about 118.5153653217.

The spelling of 1664654 in words is "one million, six hundred sixty-four thousand, six hundred fifty-four".