1664147 has 8 divisors (see below), whose sum is σ = 1796256. Its totient is φ = 1535872.

The previous prime is 1664123. The next prime is 1664227. The reversal of 1664147 is 7414661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664147 - 2⁶ = 1664083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23 + ... + 1824.

It is an arithmetic number, because the mean of its divisors is an integer number (224532).

2^1664147 is an apocalyptic number.

1664147 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1664147 is a deficient number, since it is larger than the sum of its proper divisors (132109).

1664147 is a wasteful number, since it uses less digits than its factorization.

1664147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917.

The product of its digits is 4032, while the sum is 29.

The square root of 1664147 is about 1290.0182169256. The cubic root of 1664147 is about 118.5033321121.

The spelling of 1664147 in words is "one million, six hundred sixty-four thousand, one hundred forty-seven".