42128855 has 8 divisors (see below), whose sum is σ = 50592912. Its totient is φ = 33677568.

The previous prime is 42128831. The next prime is 42128869. The reversal of 42128855 is 55882124.

It is a happy number.

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 42128855 - 2⁶ = 42128791 is a prime.

It is a super-2 number, since 2×42128855² = 3549680847222050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7079 + ... + 11591.

It is an arithmetic number, because the mean of its divisors is an integer number (6324114).

Almost surely, 2^42128855 is an apocalyptic number.

42128855 is a deficient number, since it is larger than the sum of its proper divisors (8464057).

42128855 is a wasteful number, since it uses less digits than its factorization.

42128855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6385.

The product of its digits is 25600, while the sum is 35.

The square root of 42128855 is about 6490.6744641832. The cubic root of 42128855 is about 347.9577804729.

The spelling of 42128855 in words is "forty-two million, one hundred twenty-eight thousand, eight hundred fifty-five".