1645330 has 16 divisors (see below), whose sum is σ = 3034584. Its totient is φ = 641920.

The previous prime is 1645327. The next prime is 1645337. The reversal of 1645330 is 335461.

It can be written as a sum of positive squares in 4 ways, for example, as 1181569 + 463761 = 1087^2 + 681^2 .

It is a super-2 number, since 2×1645330² = 5414221617800, which contains 22 as substring.

It is an Ulam number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1645337) 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, 1597 + ... + 2416.

2^1645330 is an apocalyptic number.

1645330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645330 is a deficient number, since it is larger than the sum of its proper divisors (1389254).

1645330 is a wasteful number, since it uses less digits than its factorization.

1645330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 1645330 is about 1282.7041747808. The cubic root of 1645330 is about 118.0549872996.

The spelling of 1645330 in words is "one million, six hundred forty-five thousand, three hundred thirty".