1644230540 has 12 divisors (see below), whose sum is σ = 3452884176. Its totient is φ = 657692208.

The previous prime is 1644230537. The next prime is 1644230573. The reversal of 1644230540 is 450324461.

It is a super-3 number, since 3×1644230540³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 41105744 + ... + 41105783.

It is an arithmetic number, because the mean of its divisors is an integer number (287740348).

Almost surely, 2^1644230540 is an apocalyptic number.

1644230540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1644230540 is an abundant number, since it is smaller than the sum of its proper divisors (1808653636).

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

1644230540 is a wasteful number, since it uses less digits than its factorization.

1644230540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82211536 (or 82211534 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 1644230540 is about 40549.1126906619. The cubic root of 1644230540 is about 1180.2868545163.

The spelling of 1644230540 in words is "one billion, six hundred forty-four million, two hundred thirty thousand, five hundred forty".