43000138 has 4 divisors (see below), whose sum is σ = 64500210. Its totient is φ = 21500068.

The previous prime is 43000121. The next prime is 43000147. The reversal of 43000138 is 83100034.

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

It can be written as a sum of positive squares in only one way, i.e., 31730689 + 11269449 = 5633^2 + 3357^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750033 + ... + 10750036.

Almost surely, 2^43000138 is an apocalyptic number.

43000138 is a deficient number, since it is larger than the sum of its proper divisors (21500072).

43000138 is a wasteful number, since it uses less digits than its factorization.

43000138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21500071.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 43000138 is about 6557.4490466949. The cubic root of 43000138 is about 350.3401808204.

The spelling of 43000138 in words is "forty-three million, one hundred thirty-eight", and thus it is an aban number.