1664430 has 32 divisors (see below), whose sum is σ = 4039200. Its totient is φ = 438912.

The previous prime is 1664417. The next prime is 1664431. The reversal of 1664430 is 344661.

It is a self number, because there is not a number n which added to its sum of digits gives 1664430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3016 + ... + 3524.

It is an arithmetic number, because the mean of its divisors is an integer number (126225).

2^1664430 is an apocalyptic number.

1664430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1664430 is an abundant number, since it is smaller than the sum of its proper divisors (2374770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664430 is a wasteful number, since it uses less digits than its factorization.

1664430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1664430 is about 1290.1279006362. The cubic root of 1664430 is about 118.5100491754.

It can be divided in two parts, 16 and 64430, that added together give a palindrome (64446).

The spelling of 1664430 in words is "one million, six hundred sixty-four thousand, four hundred thirty".