42431555 has 8 divisors (see below), whose sum is σ = 51307344. Its totient is φ = 33685600.

The previous prime is 42431549. The next prime is 42431567. The reversal of 42431555 is 55513424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42431555 - 2¹⁸ = 42169411 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31736 + ... + 33045.

It is an arithmetic number, because the mean of its divisors is an integer number (6413418).

Almost surely, 2^42431555 is an apocalyptic number.

42431555 is a deficient number, since it is larger than the sum of its proper divisors (8875789).

42431555 is a wasteful number, since it uses less digits than its factorization.

42431555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64917.

The product of its digits is 12000, while the sum is 29.

The square root of 42431555 is about 6513.9507980948. The cubic root of 42431555 is about 348.7891628361.

Adding to 42431555 its reverse (55513424), we get a palindrome (97944979).

The spelling of 42431555 in words is "forty-two million, four hundred thirty-one thousand, five hundred fifty-five".