2145543388 has 24 divisors (see below), whose sum is σ = 3807294512. Its totient is φ = 1057826304.

The previous prime is 2145543377. The next prime is 2145543397. The reversal of 2145543388 is 8833455412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97495 + ... + 117457.

Almost surely, 2^2145543388 is an apocalyptic number.

It is an amenable number.

2145543388 is a deficient number, since it is larger than the sum of its proper divisors (1661751124).

2145543388 is a wasteful number, since it uses less digits than its factorization.

2145543388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20341 (or 20339 counting only the distinct ones).

The product of its digits is 460800, while the sum is 43.

The square root of 2145543388 is about 46320.0106649383. The cubic root of 2145543388 is about 1289.7704833741.

The spelling of 2145543388 in words is "two billion, one hundred forty-five million, five hundred forty-three thousand, three hundred eighty-eight".