43138534 has 4 divisors (see below), whose sum is σ = 64707804. Its totient is φ = 21569266.

The previous prime is 43138523. The next prime is 43138549. The reversal of 43138534 is 43583134.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 43138496 and 43138505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10784632 + ... + 10784635.

It is an arithmetic number, because the mean of its divisors is an integer number (16176951).

Almost surely, 2^43138534 is an apocalyptic number.

43138534 is a deficient number, since it is larger than the sum of its proper divisors (21569270).

43138534 is a wasteful number, since it uses less digits than its factorization.

43138534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21569269.

The product of its digits is 17280, while the sum is 31.

The square root of 43138534 is about 6567.9931485957. The cubic root of 43138534 is about 350.7156350837.

The spelling of 43138534 in words is "forty-three million, one hundred thirty-eight thousand, five hundred thirty-four".