42167391 has 32 divisors (see below), whose sum is σ = 67161600. Its totient is φ = 23510592.

The previous prime is 42167387. The next prime is 42167401. The reversal of 42167391 is 19376124.

It is not a de Polignac number, because 42167391 - 2² = 42167387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42167341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43771 + ... + 44723.

It is an arithmetic number, because the mean of its divisors is an integer number (2098800).

Almost surely, 2^42167391 is an apocalyptic number.

42167391 is a deficient number, since it is larger than the sum of its proper divisors (24994209).

42167391 is an equidigital number, since it uses as much as digits as its factorization.

42167391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1006 counting only the distinct ones).

The product of its digits is 9072, while the sum is 33.

The square root of 42167391 is about 6493.6423523320. The cubic root of 42167391 is about 348.0638424950.

The spelling of 42167391 in words is "forty-two million, one hundred sixty-seven thousand, three hundred ninety-one".