42181826 has 4 divisors (see below), whose sum is σ = 63272742. Its totient is φ = 21090912.

The previous prime is 42181823. The next prime is 42181847. The reversal of 42181826 is 62818124.

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 only one way, i.e., 32478601 + 9703225 = 5699^2 + 3115^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42181792 and 42181801.

It is not an unprimeable number, because it can be changed into a prime (42181823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10545455 + ... + 10545458.

Almost surely, 2^42181826 is an apocalyptic number.

42181826 is a deficient number, since it is larger than the sum of its proper divisors (21090916).

42181826 is a wasteful number, since it uses less digits than its factorization.

42181826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21090915.

The product of its digits is 6144, while the sum is 32.

The square root of 42181826 is about 6494.7537289723. The cubic root of 42181826 is about 348.1035550805.

The spelling of 42181826 in words is "forty-two million, one hundred eighty-one thousand, eight hundred twenty-six".