42491557 has 8 divisors (see below), whose sum is σ = 44591040. Its totient is φ = 40413120.

The previous prime is 42491549. The next prime is 42491567. The reversal of 42491557 is 75519424.

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 42491557 - 2³ = 42491549 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 (42491567) 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, 1044 + ... + 9277.

It is an arithmetic number, because the mean of its divisors is an integer number (5573880).

Almost surely, 2^42491557 is an apocalyptic number.

It is an amenable number.

42491557 is a deficient number, since it is larger than the sum of its proper divisors (2099483).

42491557 is a wasteful number, since it uses less digits than its factorization.

42491557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10523.

The product of its digits is 50400, while the sum is 37.

The square root of 42491557 is about 6518.5548244991. The cubic root of 42491557 is about 348.9534917212.

The spelling of 42491557 in words is "forty-two million, four hundred ninety-one thousand, five hundred fifty-seven".