42957949 has 2 divisors, whose sum is σ = 42957950. Its totient is φ = 42957948.

The previous prime is 42957947. The next prime is 42957973. The reversal of 42957949 is 94975924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31158724 + 11799225 = 5582^2 + 3435^2 .

It is a cyclic number.

It is not a de Polignac number, because 42957949 - 2¹ = 42957947 is a prime.

Together with 42957947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42957947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21478974 + 21478975.

It is an arithmetic number, because the mean of its divisors is an integer number (21478975).

Almost surely, 2^42957949 is an apocalyptic number.

It is an amenable number.

42957949 is a deficient number, since it is larger than the sum of its proper divisors (1).

42957949 is an equidigital number, since it uses as much as digits as its factorization.

42957949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 42957949 is about 6554.2313813292. The cubic root of 42957949 is about 350.2255661617.

The spelling of 42957949 in words is "forty-two million, nine hundred fifty-seven thousand, nine hundred forty-nine".