42523157 has 4 divisors (see below), whose sum is σ = 43105740. Its totient is φ = 41940576.

The previous prime is 42523147. The next prime is 42523177. The reversal of 42523157 is 75132524.

It is a happy number.

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 11062276 + 31460881 = 3326^2 + 5609^2 .

It is a cyclic number.

It is not a de Polignac number, because 42523157 - 2⁸ = 42522901 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 (42523147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291182 + ... + 291327.

It is an arithmetic number, because the mean of its divisors is an integer number (10776435).

Almost surely, 2^42523157 is an apocalyptic number.

It is an amenable number.

42523157 is a deficient number, since it is larger than the sum of its proper divisors (582583).

42523157 is an equidigital number, since it uses as much as digits as its factorization.

42523157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582582.

The product of its digits is 8400, while the sum is 29.

The square root of 42523157 is about 6520.9782241624. The cubic root of 42523157 is about 349.0399731994.

The spelling of 42523157 in words is "forty-two million, five hundred twenty-three thousand, one hundred fifty-seven".