43138157 has 4 divisors (see below), whose sum is σ = 43164060. Its totient is φ = 43112256.

The previous prime is 43138153. The next prime is 43138181. The reversal of 43138157 is 75183134.

43138157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35772361 + 7365796 = 5981^2 + 2714^2 .

It is a cyclic number.

It is not a de Polignac number, because 43138157 - 2² = 43138153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43138153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10268 + ... + 13845.

It is an arithmetic number, because the mean of its divisors is an integer number (10791015).

Almost surely, 2^43138157 is an apocalyptic number.

It is an amenable number.

43138157 is a deficient number, since it is larger than the sum of its proper divisors (25903).

43138157 is a wasteful number, since it uses less digits than its factorization.

43138157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25902.

The product of its digits is 10080, while the sum is 32.

The square root of 43138157 is about 6567.9644487467. The cubic root of 43138157 is about 350.7146134126.

The spelling of 43138157 in words is "forty-three million, one hundred thirty-eight thousand, one hundred fifty-seven".