43121040 has 40 divisors (see below), whose sum is σ = 133675968. Its totient is φ = 11498880.

The previous prime is 43121033. The next prime is 43121063. The reversal of 43121040 is 4012134.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89596 + ... + 90075.

Almost surely, 2^43121040 is an apocalyptic number.

43121040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43121040 is an abundant number, since it is smaller than the sum of its proper divisors (90554928).

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

43121040 is a wasteful number, since it uses less digits than its factorization.

43121040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179687 (or 179681 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 43121040 is about 6566.6612521128. The cubic root of 43121040 is about 350.6682200210.

Adding to 43121040 its reverse (4012134), we get a palindrome (47133174).

The spelling of 43121040 in words is "forty-three million, one hundred twenty-one thousand, forty".