43394867840 has 32 divisors (see below), whose sum is σ = 103740857460. Its totient is φ = 17357946880.

The previous prime is 43394867833. The next prime is 43394867863. The reversal of 43394867840 is 4876849334.

It can be written as a sum of positive squares in 2 ways, for example, as 43154245696 + 240622144 = 207736^2 + 15512^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×43394867840² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33901601 + ... + 33902880.

Almost surely, 2^43394867840 is an apocalyptic number.

43394867840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43394867840 is an abundant number, since it is smaller than the sum of its proper divisors (60345989620).

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

43394867840 is an equidigital number, since it uses as much as digits as its factorization.

43394867840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67804500 (or 67804488 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 56.

The spelling of 43394867840 in words is "forty-three billion, three hundred ninety-four million, eight hundred sixty-seven thousand, eight hundred forty".