42591803 has 4 divisors (see below), whose sum is σ = 42726480. Its totient is φ = 42457128.

The previous prime is 42591779. The next prime is 42591811. The reversal of 42591803 is 30819524.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42591803 - 2⁶ = 42591739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42591803.

It is not an unprimeable number, because it can be changed into a prime (42591893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66863 + ... + 67496.

It is an arithmetic number, because the mean of its divisors is an integer number (10681620).

Almost surely, 2^42591803 is an apocalyptic number.

42591803 is a deficient number, since it is larger than the sum of its proper divisors (134677).

42591803 is a wasteful number, since it uses less digits than its factorization.

42591803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134676.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 42591803 is about 6526.2395757434. The cubic root of 42591803 is about 349.2276930059.

Adding to 42591803 its sum of digits (32), we get a triangular number (42591835 = T₉₂₂₉).

The spelling of 42591803 in words is "forty-two million, five hundred ninety-one thousand, eight hundred three".