42381997 has 4 divisors (see below), whose sum is σ = 48436576. Its totient is φ = 36327420.

The previous prime is 42381979. The next prime is 42382061. The reversal of 42381997 is 79918324.

42381997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42381997 - 2⁷ = 42381869 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 (42381907) 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 3 ways as a sum of consecutive naturals, for example, 3027279 + ... + 3027292.

It is an arithmetic number, because the mean of its divisors is an integer number (12109144).

Almost surely, 2^42381997 is an apocalyptic number.

It is an amenable number.

42381997 is a deficient number, since it is larger than the sum of its proper divisors (6054579).

42381997 is an equidigital number, since it uses as much as digits as its factorization.

42381997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6054578.

The product of its digits is 108864, while the sum is 43.

The square root of 42381997 is about 6510.1456972943. The cubic root of 42381997 is about 348.6533203233.

The spelling of 42381997 in words is "forty-two million, three hundred eighty-one thousand, nine hundred ninety-seven".