42180939 has 16 divisors (see below), whose sum is σ = 62668800. Its totient is φ = 28040328.

The previous prime is 42180937. The next prime is 42180947. The reversal of 42180939 is 93908124.

It is not a de Polignac number, because 42180939 - 2¹ = 42180937 is a prime.

It is a super-2 number, since 2×42180939² = 3558463229843442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42180937) 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 15 ways as a sum of consecutive naturals, for example, 8302 + ... + 12380.

It is an arithmetic number, because the mean of its divisors is an integer number (3916800).

Almost surely, 2^42180939 is an apocalyptic number.

42180939 is a deficient number, since it is larger than the sum of its proper divisors (20487861).

42180939 is a wasteful number, since it uses less digits than its factorization.

42180939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4471 (or 4465 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 42180939 is about 6494.6854427293. The cubic root of 42180939 is about 348.1011150880.

The spelling of 42180939 in words is "forty-two million, one hundred eighty thousand, nine hundred thirty-nine".