42131778 has 32 divisors (see below), whose sum is σ = 95524800. Its totient is φ = 12280896.

The previous prime is 42131777. The next prime is 42131779. The reversal of 42131778 is 87713124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (42131777) and next prime (42131779).

It is not an unprimeable number, because it can be changed into a prime (42131777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12733 + ... + 15696.

It is an arithmetic number, because the mean of its divisors is an integer number (2985150).

Almost surely, 2^42131778 is an apocalyptic number.

42131778 is an abundant number, since it is smaller than the sum of its proper divisors (53393022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42131778 is a wasteful number, since it uses less digits than its factorization.

42131778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28466.

The product of its digits is 9408, while the sum is 33.

The square root of 42131778 is about 6490.8996294813. The cubic root of 42131778 is about 347.9658276658.

The spelling of 42131778 in words is "forty-two million, one hundred thirty-one thousand, seven hundred seventy-eight".