1644246012 has 24 divisors (see below), whose sum is σ = 3864179200. Its totient is φ = 544138416.

The previous prime is 1644245989. The next prime is 1644246047. The reversal of 1644246012 is 2106424461.

It is a happy number.

It is a super-3 number, since 3×1644246012³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491212 + ... + 494547.

Almost surely, 2^1644246012 is an apocalyptic number.

1644246012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1644246012 is an abundant number, since it is smaller than the sum of its proper divisors (2219933188).

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

1644246012 is a wasteful number, since it uses less digits than its factorization.

1644246012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985905 (or 985903 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 1644246012 is about 40549.3034712065. The cubic root of 1644246012 is about 1180.2905566211.

The spelling of 1644246012 in words is "one billion, six hundred forty-four million, two hundred forty-six thousand, twelve".