42229431 has 20 divisors (see below), whose sum is σ = 63525000. Its totient is φ = 27956016.

The previous prime is 42229417. The next prime is 42229441. The reversal of 42229431 is 13492224.

42229431 is a `hidden beast` number, since 4 + 2 + 229 + 431 = 666.

It is not a de Polignac number, because 42229431 - 2⁵ = 42229399 is a prime.

It is a super-2 number, since 2×42229431² = 3566649685167522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 42229395 and 42229404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42229441) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10320 + ... + 13818.

It is an arithmetic number, because the mean of its divisors is an integer number (3176250).

Almost surely, 2^42229431 is an apocalyptic number.

42229431 is a deficient number, since it is larger than the sum of its proper divisors (21295569).

42229431 is a wasteful number, since it uses less digits than its factorization.

42229431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3660 (or 3651 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 42229431 is about 6498.4175766105. The cubic root of 42229431 is about 348.2344585304.

The spelling of 42229431 in words is "forty-two million, two hundred twenty-nine thousand, four hundred thirty-one".