42103991 has 8 divisors (see below), whose sum is σ = 43201200. Its totient is φ = 41020992.

The previous prime is 42103987. The next prime is 42104003. The reversal of 42103991 is 19930124.

It is a happy number.

42103991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 42103991 - 2² = 42103987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42103931) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2585 + ... + 9533.

It is an arithmetic number, because the mean of its divisors is an integer number (5400150).

Almost surely, 2^42103991 is an apocalyptic number.

42103991 is a deficient number, since it is larger than the sum of its proper divisors (1097209).

42103991 is an equidigital number, since it uses as much as digits as its factorization.

42103991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7105.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 42103991 is about 6488.7588181408. The cubic root of 42103991 is about 347.8893133471.

The spelling of 42103991 in words is "forty-two million, one hundred three thousand, nine hundred ninety-one".