42391563 has 8 divisors (see below), whose sum is σ = 56587776. Its totient is φ = 28228200.

The previous prime is 42391561. The next prime is 42391571. The reversal of 42391563 is 36519324.

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

It is not a de Polignac number, because 42391563 - 2¹ = 42391561 is a prime.

It is a super-2 number, since 2×42391563² = 3594089227165938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42391561) 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 7 ways as a sum of consecutive naturals, for example, 5023 + ... + 10488.

It is an arithmetic number, because the mean of its divisors is an integer number (7073472).

Almost surely, 2^42391563 is an apocalyptic number.

42391563 is a deficient number, since it is larger than the sum of its proper divisors (14196213).

42391563 is a wasteful number, since it uses less digits than its factorization.

42391563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16425.

The product of its digits is 19440, while the sum is 33.

The square root of 42391563 is about 6510.8803552208. The cubic root of 42391563 is about 348.6795497524.

The spelling of 42391563 in words is "forty-two million, three hundred ninety-one thousand, five hundred sixty-three".