43487138 has 6 divisors (see below), whose sum is σ = 65244699. Its totient is φ = 21738906.

The previous prime is 43487063. The next prime is 43487149. The reversal of 43487138 is 83178434.

It can be written as a sum of positive squares in only one way, i.e., 21743569 + 21743569 = 4663^2 + 4663^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=4663.

It is a super-2 number, since 2×43487138² = 3782262342862088, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6995 + ... + 11657.

Almost surely, 2^43487138 is an apocalyptic number.

43487138 is a deficient number, since it is larger than the sum of its proper divisors (21757561).

43487138 is an frugal number, since it uses more digits than its factorization.

43487138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9328 (or 4665 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 43487138 is about 6594.4778413457. The cubic root of 43487138 is about 351.6578167875.

The spelling of 43487138 in words is "forty-three million, four hundred eighty-seven thousand, one hundred thirty-eight".