42188457 has 4 divisors (see below), whose sum is σ = 56251280. Its totient is φ = 28125636.

The previous prime is 42188453. The next prime is 42188459. The reversal of 42188457 is 75488124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42188457 - 2² = 42188453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42188453) 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, 7031407 + ... + 7031412.

It is an arithmetic number, because the mean of its divisors is an integer number (14062820).

Almost surely, 2^42188457 is an apocalyptic number.

It is an amenable number.

42188457 is a deficient number, since it is larger than the sum of its proper divisors (14062823).

42188457 is a wasteful number, since it uses less digits than its factorization.

42188457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14062822.

The product of its digits is 71680, while the sum is 39.

The square root of 42188457 is about 6495.2641978599. The cubic root of 42188457 is about 348.1217947977.

The spelling of 42188457 in words is "forty-two million, one hundred eighty-eight thousand, four hundred fifty-seven".