42643557 has 32 divisors (see below), whose sum is σ = 69980160. Its totient is φ = 25446960.

The previous prime is 42643547. The next prime is 42643583. The reversal of 42643557 is 75534624.

42643557 is a `hidden beast` number, since 4 + 2 + 643 + 5 + 5 + 7 = 666.

It is not a de Polignac number, because 42643557 - 2⁸ = 42643301 is a prime.

It is a super-2 number, since 2×42643557² = 3636945907224498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42643537) 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 31 ways as a sum of consecutive naturals, for example, 18828 + ... + 20970.

It is an arithmetic number, because the mean of its divisors is an integer number (2186880).

Almost surely, 2^42643557 is an apocalyptic number.

It is an amenable number.

42643557 is a deficient number, since it is larger than the sum of its proper divisors (27336603).

42643557 is a wasteful number, since it uses less digits than its factorization.

42643557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230 (or 2224 counting only the distinct ones).

The product of its digits is 100800, while the sum is 36.

The square root of 42643557 is about 6530.2034424664. The cubic root of 42643557 is about 349.3690865217.

The spelling of 42643557 in words is "forty-two million, six hundred forty-three thousand, five hundred fifty-seven".