43521534 has 48 divisors (see below), whose sum is σ = 109006560. Its totient is φ = 12291840.

The previous prime is 43521529. The next prime is 43521539. The reversal of 43521534 is 43512534.

It is an interprime number because it is at equal distance from previous prime (43521529) and next prime (43521539).

It is a junction number, because it is equal to n+sod(n) for n = 43521498 and 43521507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43521539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9274 + ... + 13154.

It is an arithmetic number, because the mean of its divisors is an integer number (2270970).

Almost surely, 2^43521534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43521534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54503280).

43521534 is an abundant number, since it is smaller than the sum of its proper divisors (65485026).

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

43521534 is a wasteful number, since it uses less digits than its factorization.

43521534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985 (or 3982 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 43521534 is about 6597.0852654790. The cubic root of 43521534 is about 351.7505065285.

It can be divided in two parts, 4352 and 1534, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 43521534 in words is "forty-three million, five hundred twenty-one thousand, five hundred thirty-four".