42431515 has 16 divisors (see below), whose sum is σ = 59613120. Its totient is φ = 28385280.

The previous prime is 42431461. The next prime is 42431533. The reversal of 42431515 is 51513424.

It is a happy number.

42431515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42431515 - 2⁹ = 42431003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42431515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13350 + ... + 16219.

It is an arithmetic number, because the mean of its divisors is an integer number (3725820).

Almost surely, 2^42431515 is an apocalyptic number.

42431515 is a deficient number, since it is larger than the sum of its proper divisors (17181605).

42431515 is a wasteful number, since it uses less digits than its factorization.

42431515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29622.

The product of its digits is 2400, while the sum is 25.

The square root of 42431515 is about 6513.9477277608. The cubic root of 42431515 is about 348.7890532355.

Adding to 42431515 its reverse (51513424), we get a palindrome (93944939).

The spelling of 42431515 in words is "forty-two million, four hundred thirty-one thousand, five hundred fifteen".