1664231 has 4 divisors (see below), whose sum is σ = 1704864. Its totient is φ = 1623600.

The previous prime is 1664227. The next prime is 1664251. The reversal of 1664231 is 1324661.

It is a happy number.

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

It is not a de Polignac number, because 1664231 - 2² = 1664227 is a prime.

It is a super-2 number, since 2×1664231² = 5539329642722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664197 and 1664206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20255 + ... + 20336.

It is an arithmetic number, because the mean of its divisors is an integer number (426216).

2^1664231 is an apocalyptic number.

1664231 is a deficient number, since it is larger than the sum of its proper divisors (40633).

1664231 is an equidigital number, since it uses as much as digits as its factorization.

1664231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40632.

The product of its digits is 864, while the sum is 23.

The square root of 1664231 is about 1290.0507741946. The cubic root of 1664231 is about 118.5053259489.

Adding to 1664231 its reverse (1324661), we get a palindrome (2988892).

The spelling of 1664231 in words is "one million, six hundred sixty-four thousand, two hundred thirty-one".