43406538 has 16 divisors (see below), whose sum is σ = 99215040. Its totient is φ = 12401856.

The previous prime is 43406537. The next prime is 43406549. The reversal of 43406538 is 83560434.

It is a super-2 number, since 2×43406538² = 3768255082290888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43406499 and 43406508.

It is not an unprimeable number, because it can be changed into a prime (43406537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516703 + ... + 516786.

It is an arithmetic number, because the mean of its divisors is an integer number (6200940).

Almost surely, 2^43406538 is an apocalyptic number.

43406538 is an abundant number, since it is smaller than the sum of its proper divisors (55808502).

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

43406538 is a wasteful number, since it uses less digits than its factorization.

43406538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033501.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 43406538 is about 6588.3638333049. The cubic root of 43406538 is about 351.4404256976.

It can be divided in two parts, 4340 and 6538, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 43406538 in words is "forty-three million, four hundred six thousand, five hundred thirty-eight".