1664450 has 12 divisors (see below), whose sum is σ = 3095970. Its totient is φ = 665760.

The previous prime is 1664447. The next prime is 1664459. The reversal of 1664450 is 544661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 744769 + 919681 = 863^2 + 959^2 .

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1664459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16595 + ... + 16694.

2^1664450 is an apocalyptic number.

1664450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1664450 is a deficient number, since it is larger than the sum of its proper divisors (1431520).

1664450 is a wasteful number, since it uses less digits than its factorization.

1664450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33301 (or 33296 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1664450 is about 1290.1356517824. The cubic root of 1664450 is about 118.5105238507.

The spelling of 1664450 in words is "one million, six hundred sixty-four thousand, four hundred fifty".