442878155 has 8 divisors (see below), whose sum is σ = 534637152. Its totient is φ = 352180288.

The previous prime is 442878127. The next prime is 442878157. The reversal of 442878155 is 551878244.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 442878155 - 2⁶ = 442878091 is a prime.

It is a super-2 number, since 2×442878155² = 392282120352408050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442878157) 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, 264362 + ... + 266031.

It is an arithmetic number, because the mean of its divisors is an integer number (66829644).

Almost surely, 2^442878155 is an apocalyptic number.

442878155 is a deficient number, since it is larger than the sum of its proper divisors (91758997).

442878155 is a wasteful number, since it uses less digits than its factorization.

442878155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530565.

The product of its digits is 358400, while the sum is 44.

The square root of 442878155 is about 21044.6704654646. The cubic root of 442878155 is about 762.2452962779.

The spelling of 442878155 in words is "four hundred forty-two million, eight hundred seventy-eight thousand, one hundred fifty-five".