43138965 has 16 divisors (see below), whose sum is σ = 69121728. Its totient is φ = 22974336.

The previous prime is 43138957. The next prime is 43138969. The reversal of 43138965 is 56983134.

It is not a de Polignac number, because 43138965 - 2³ = 43138957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43138969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11617 + ... + 14873.

It is an arithmetic number, because the mean of its divisors is an integer number (4320108).

Almost surely, 2^43138965 is an apocalyptic number.

It is an amenable number.

43138965 is a deficient number, since it is larger than the sum of its proper divisors (25982763).

43138965 is a wasteful number, since it uses less digits than its factorization.

43138965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148.

The product of its digits is 77760, while the sum is 39.

The square root of 43138965 is about 6568.0259591448. The cubic root of 43138965 is about 350.7168030876.

The spelling of 43138965 in words is "forty-three million, one hundred thirty-eight thousand, nine hundred sixty-five".