42017391 has 24 divisors (see below), whose sum is σ = 65585520. Its totient is φ = 25767936.

The previous prime is 42017383. The next prime is 42017419. The reversal of 42017391 is 19371024.

It is not a de Polignac number, because 42017391 - 2³ = 42017383 is a prime.

It is a super-2 number, since 2×42017391² = 3530922292893762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42017191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54255 + ... + 55023.

It is an arithmetic number, because the mean of its divisors is an integer number (2732730).

Almost surely, 2^42017391 is an apocalyptic number.

42017391 is a deficient number, since it is larger than the sum of its proper divisors (23568129).

42017391 is a wasteful number, since it uses less digits than its factorization.

42017391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255 (or 1252 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 42017391 is about 6482.0823043217. The cubic root of 42017391 is about 347.6506353121.

The spelling of 42017391 in words is "forty-two million, seventeen thousand, three hundred ninety-one".