42127801 has 4 divisors (see below), whose sum is σ = 42278004. Its totient is φ = 41977600.

The previous prime is 42127783. The next prime is 42127823. The reversal of 42127801 is 10872124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25765776 + 16362025 = 5076^2 + 4045^2 .

It is a cyclic number.

It is not a de Polignac number, because 42127801 - 2⁹ = 42127289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42127861) 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, 74680 + ... + 75241.

It is an arithmetic number, because the mean of its divisors is an integer number (10569501).

Almost surely, 2^42127801 is an apocalyptic number.

It is an amenable number.

42127801 is a deficient number, since it is larger than the sum of its proper divisors (150203).

42127801 is a wasteful number, since it uses less digits than its factorization.

42127801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150202.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 42127801 is about 6490.5932702643. The cubic root of 42127801 is about 347.9548786568.

Adding to 42127801 its reverse (10872124), we get a palindrome (52999925).

The spelling of 42127801 in words is "forty-two million, one hundred twenty-seven thousand, eight hundred one".