42248557 has 4 divisors (see below), whose sum is σ = 45498460. Its totient is φ = 38998656.

The previous prime is 42248551. The next prime is 42248581. The reversal of 42248557 is 75584224.

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 10201636 + 32046921 = 3194^2 + 5661^2 .

It is a cyclic number.

It is not a de Polignac number, because 42248557 - 2¹¹ = 42246509 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42248551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1624932 + ... + 1624957.

It is an arithmetic number, because the mean of its divisors is an integer number (11374615).

Almost surely, 2^42248557 is an apocalyptic number.

It is an amenable number.

42248557 is a deficient number, since it is larger than the sum of its proper divisors (3249903).

42248557 is a wasteful number, since it uses less digits than its factorization.

42248557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3249902.

The product of its digits is 89600, while the sum is 37.

The square root of 42248557 is about 6499.8889990522. Note that the first 3 decimals coincide. The cubic root of 42248557 is about 348.2870231900.

The spelling of 42248557 in words is "forty-two million, two hundred forty-eight thousand, five hundred fifty-seven".