1645346 has 4 divisors (see below), whose sum is σ = 2468022. Its totient is φ = 822672.

The previous prime is 1645337. The next prime is 1645349. The reversal of 1645346 is 6435461.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1590121 + 55225 = 1261^2 + 235^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1645349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411335 + ... + 411338.

2^1645346 is an apocalyptic number.

1645346 is a deficient number, since it is larger than the sum of its proper divisors (822676).

1645346 is an equidigital number, since it uses as much as digits as its factorization.

1645346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822675.

The product of its digits is 8640, while the sum is 29.

The square root of 1645346 is about 1282.7104115895. The cubic root of 1645346 is about 118.0553699733.

It can be divided in two parts, 1645 and 346, that added together give a palindrome (1991).

The spelling of 1645346 in words is "one million, six hundred forty-five thousand, three hundred forty-six".