42639515 has 12 divisors (see below), whose sum is σ = 54004464. Its totient is φ = 32314896.

The previous prime is 42639511. The next prime is 42639517. The reversal of 42639515 is 51593624.

It is not a de Polignac number, because 42639515 - 2² = 42639511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42639511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10007 + ... + 13616.

It is an arithmetic number, because the mean of its divisors is an integer number (4500372).

Almost surely, 2^42639515 is an apocalyptic number.

42639515 is a deficient number, since it is larger than the sum of its proper divisors (11364949).

42639515 is a wasteful number, since it uses less digits than its factorization.

42639515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23666 (or 23647 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 42639515 is about 6529.8939501343. The cubic root of 42639515 is about 349.3580477735.

The spelling of 42639515 in words is "forty-two million, six hundred thirty-nine thousand, five hundred fifteen".