42420444397 has 4 divisors (see below), whose sum is σ = 43139435040. Its totient is φ = 41701453756.

The previous prime is 42420444349. The next prime is 42420444421. The reversal of 42420444397 is 79344402424.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42420444397 - 2²³ = 42412055789 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 (42420444307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359495233 + ... + 359495350.

It is an arithmetic number, because the mean of its divisors is an integer number (10784858760).

Almost surely, 2^42420444397 is an apocalyptic number.

It is an amenable number.

42420444397 is a deficient number, since it is larger than the sum of its proper divisors (718990643).

42420444397 is an equidigital number, since it uses as much as digits as its factorization.

42420444397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718990642.

The product of its (nonzero) digits is 774144, while the sum is 43.

The spelling of 42420444397 in words is "forty-two billion, four hundred twenty million, four hundred forty-four thousand, three hundred ninety-seven".