42043557 has 4 divisors (see below), whose sum is σ = 56058080. Its totient is φ = 28029036.

The previous prime is 42043553. The next prime is 42043559. The reversal of 42043557 is 75534024.

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 42043557 - 2² = 42043553 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 (42043553) 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, 7007257 + ... + 7007262.

It is an arithmetic number, because the mean of its divisors is an integer number (14014520).

Almost surely, 2^42043557 is an apocalyptic number.

It is an amenable number.

42043557 is a deficient number, since it is larger than the sum of its proper divisors (14014523).

42043557 is a wasteful number, since it uses less digits than its factorization.

42043557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14014522.

The product of its (nonzero) digits is 16800, while the sum is 30.

The square root of 42043557 is about 6484.1003230980. The cubic root of 42043557 is about 347.7227859040.

The spelling of 42043557 in words is "forty-two million, forty-three thousand, five hundred fifty-seven".