43906538 has 12 divisors (see below), whose sum is σ = 71316198. Its totient is φ = 20264400.

The previous prime is 43906537. The next prime is 43906543. The reversal of 43906538 is 83560934.

It can be written as a sum of positive squares in 3 ways, for example, as 28121809 + 15784729 = 5303^2 + 3973^2 .

It is a super-3 number, since 3×43906538³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (43906537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64613 + ... + 65288.

Almost surely, 2^43906538 is an apocalyptic number.

43906538 is a deficient number, since it is larger than the sum of its proper divisors (27409660).

43906538 is a wasteful number, since it uses less digits than its factorization.

43906538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129929 (or 129916 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 43906538 is about 6626.2008722948. The cubic root of 43906538 is about 352.7846916279.

It can be divided in two parts, 43906 and 538, that added together give a palindrome (44444).

The spelling of 43906538 in words is "forty-three million, nine hundred six thousand, five hundred thirty-eight".