19432143440 has 20 divisors (see below), whose sum is σ = 45179733684. Its totient is φ = 7772857344.

The previous prime is 19432143413. The next prime is 19432143443. The reversal of 19432143440 is 4434123491.

It can be written as a sum of positive squares in 2 ways, for example, as 5183424016 + 14248719424 = 71996^2 + 119368^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 19432143440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19432143443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121450817 + ... + 121450976.

Almost surely, 2^19432143440 is an apocalyptic number.

19432143440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19432143440 is an abundant number, since it is smaller than the sum of its proper divisors (25747590244).

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

19432143440 is a wasteful number, since it uses less digits than its factorization.

19432143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242901806 (or 242901800 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 19432143440 in words is "nineteen billion, four hundred thirty-two million, one hundred forty-three thousand, four hundred forty".