43873138 has 4 divisors (see below), whose sum is σ = 65809710. Its totient is φ = 21936568.

The previous prime is 43873129. The next prime is 43873171. The reversal of 43873138 is 83137834.

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., 43599609 + 273529 = 6603^2 + 523^2 .

It is a junction number, because it is equal to n+sod(n) for n = 43873097 and 43873106.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968283 + ... + 10968286.

Almost surely, 2^43873138 is an apocalyptic number.

43873138 is a deficient number, since it is larger than the sum of its proper divisors (21936572).

43873138 is a wasteful number, since it uses less digits than its factorization.

43873138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21936571.

The product of its digits is 48384, while the sum is 37.

The square root of 43873138 is about 6623.6800949321. The cubic root of 43873138 is about 352.6952137027.

It can be divided in two parts, 43 and 873138, that added together give a triangular number (873181 = T₁₃₂₁).

The spelling of 43873138 in words is "forty-three million, eight hundred seventy-three thousand, one hundred thirty-eight".