42158257 has 8 divisors (see below), whose sum is σ = 44015400. Its totient is φ = 40328064.

The previous prime is 42158251. The next prime is 42158293. The reversal of 42158257 is 75285124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6170256 + 35988001 = 2484^2 + 5999^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42158257 - 2²³ = 33769649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42158251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3508 + ... + 9829.

It is an arithmetic number, because the mean of its divisors is an integer number (5501925).

Almost surely, 2^42158257 is an apocalyptic number.

It is an amenable number.

42158257 is a deficient number, since it is larger than the sum of its proper divisors (1857143).

42158257 is a wasteful number, since it uses less digits than its factorization.

42158257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13475.

The product of its digits is 22400, while the sum is 34.

The square root of 42158257 is about 6492.9390109564. The cubic root of 42158257 is about 348.0387089764.

The spelling of 42158257 in words is "forty-two million, one hundred fifty-eight thousand, two hundred fifty-seven".