1644312426 has 16 divisors (see below), whose sum is σ = 3293997024. Its totient is φ = 547208784.

The previous prime is 1644312391. The next prime is 1644312427. The reversal of 1644312426 is 6242134461.

It is a happy number.

It is a super-3 number, since 3×1644312426³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644312427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219856 + ... + 227211.

It is an arithmetic number, because the mean of its divisors is an integer number (205874814).

Almost surely, 2^1644312426 is an apocalyptic number.

1644312426 is an abundant number, since it is smaller than the sum of its proper divisors (1649684598).

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

1644312426 is a wasteful number, since it uses less digits than its factorization.

1644312426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447685.

The product of its digits is 27648, while the sum is 33.

The square root of 1644312426 is about 40550.1223919238. The cubic root of 1644312426 is about 1180.3064477471.

Adding to 1644312426 its reverse (6242134461), we get a palindrome (7886446887).

The spelling of 1644312426 in words is "one billion, six hundred forty-four million, three hundred twelve thousand, four hundred twenty-six".