42057491 has 8 divisors (see below), whose sum is σ = 48173664. Its totient is φ = 35968320.

The previous prime is 42057481. The next prime is 42057523. The reversal of 42057491 is 19475024.

It is a happy number.

42057491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42057491 - 2¹⁴ = 42041107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42057401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3290 + ... + 9743.

It is an arithmetic number, because the mean of its divisors is an integer number (6021708).

Almost surely, 2^42057491 is an apocalyptic number.

42057491 is a deficient number, since it is larger than the sum of its proper divisors (6116173).

42057491 is a wasteful number, since it uses less digits than its factorization.

42057491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13501.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 42057491 is about 6485.1747085179. The cubic root of 42057491 is about 347.7611955477.

The spelling of 42057491 in words is "forty-two million, fifty-seven thousand, four hundred ninety-one".