43138373 has 2 divisors, whose sum is σ = 43138374. Its totient is φ = 43138372.

The previous prime is 43138369. The next prime is 43138397. The reversal of 43138373 is 37383134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37368769 + 5769604 = 6113^2 + 2402^2 .

It is a cyclic number.

It is not a de Polignac number, because 43138373 - 2² = 43138369 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43138313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21569186 + 21569187.

It is an arithmetic number, because the mean of its divisors is an integer number (21569187).

Almost surely, 2^43138373 is an apocalyptic number.

It is an amenable number.

43138373 is a deficient number, since it is larger than the sum of its proper divisors (1).

43138373 is an equidigital number, since it uses as much as digits as its factorization.

43138373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 32.

The square root of 43138373 is about 6567.9808921768. The cubic root of 43138373 is about 350.7151987739.

The spelling of 43138373 in words is "forty-three million, one hundred thirty-eight thousand, three hundred seventy-three".