43989157 has 2 divisors, whose sum is σ = 43989158. Its totient is φ = 43989156.

The previous prime is 43989151. The next prime is 43989173. The reversal of 43989157 is 75198934.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41912676 + 2076481 = 6474^2 + 1441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43989157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43989151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21994578 + 21994579.

It is an arithmetic number, because the mean of its divisors is an integer number (21994579).

Almost surely, 2^43989157 is an apocalyptic number.

It is an amenable number.

43989157 is a deficient number, since it is larger than the sum of its proper divisors (1).

43989157 is an equidigital number, since it uses as much as digits as its factorization.

43989157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 43989157 is about 6632.4322084738. The cubic root of 43989157 is about 353.0058314782.

The spelling of 43989157 in words is "forty-three million, nine hundred eighty-nine thousand, one hundred fifty-seven".