43381040 has 20 divisors (see below), whose sum is σ = 100861104. Its totient is φ = 17352384.

The previous prime is 43380979. The next prime is 43381069. The reversal of 43381040 is 4018334.

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

It is a junction number, because it is equal to n+sod(n) for n = 43380997 and 43381015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271052 + ... + 271211.

Almost surely, 2^43381040 is an apocalyptic number.

43381040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43381040 is an abundant number, since it is smaller than the sum of its proper divisors (57480064).

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

43381040 is a wasteful number, since it uses less digits than its factorization.

43381040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542276 (or 542270 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 43381040 is about 6586.4284707268. The cubic root of 43381040 is about 351.3715974857.

Adding to 43381040 its reverse (4018334), we get a palindrome (47399374).

The spelling of 43381040 in words is "forty-three million, three hundred eighty-one thousand, forty".