42179391 has 6 divisors (see below), whose sum is σ = 60925800. Its totient is φ = 28119588.

The previous prime is 42179377. The next prime is 42179399. The reversal of 42179391 is 19397124.

It is not a de Polignac number, because 42179391 - 2¹⁷ = 42048319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42179399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2343291 + ... + 2343308.

It is an arithmetic number, because the mean of its divisors is an integer number (10154300).

Almost surely, 2^42179391 is an apocalyptic number.

42179391 is a deficient number, since it is larger than the sum of its proper divisors (18746409).

42179391 is a wasteful number, since it uses less digits than its factorization.

42179391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4686605 (or 4686602 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 42179391 is about 6494.5662672730. The cubic root of 42179391 is about 348.0968567102.

The spelling of 42179391 in words is "forty-two million, one hundred seventy-nine thousand, three hundred ninety-one".