42390791 has 8 divisors (see below), whose sum is σ = 43189200. Its totient is φ = 41595840.

The previous prime is 42390787. The next prime is 42390797. The reversal of 42390791 is 19709324.

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 42390791 - 2² = 42390787 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 (42390797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48920 + ... + 49778.

It is an arithmetic number, because the mean of its divisors is an integer number (5398650).

Almost surely, 2^42390791 is an apocalyptic number.

42390791 is a deficient number, since it is larger than the sum of its proper divisors (798409).

42390791 is an equidigital number, since it uses as much as digits as its factorization.

42390791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 42390791 is about 6510.8210695733. The cubic root of 42390791 is about 348.6774331186.

The spelling of 42390791 in words is "forty-two million, three hundred ninety thousand, seven hundred ninety-one".