42445431 has 16 divisors (see below), whose sum is σ = 71865600. Its totient is φ = 24254424.

The previous prime is 42445409. The next prime is 42445451. The reversal of 42445431 is 13454424.

It is a happy number.

It is not a de Polignac number, because 42445431 - 2⁷ = 42445303 is a prime.

It is a super-2 number, since 2×42445431² = 3603229225551522, 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 = 42445395 and 42445404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42445451) 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, 112101 + ... + 112478.

It is an arithmetic number, because the mean of its divisors is an integer number (4491600).

Almost surely, 2^42445431 is an apocalyptic number.

42445431 is a deficient number, since it is larger than the sum of its proper divisors (29420169).

42445431 is a wasteful number, since it uses less digits than its factorization.

42445431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224595 (or 224589 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 42445431 is about 6515.0158096508. The cubic root of 42445431 is about 348.8271791265.

Adding to 42445431 its reverse (13454424), we get a palindrome (55899855).

The spelling of 42445431 in words is "forty-two million, four hundred forty-five thousand, four hundred thirty-one".