42001986 has 16 divisors (see below), whose sum is σ = 90465984. Its totient is φ = 12923664.

The previous prime is 42001969. The next prime is 42001997. The reversal of 42001986 is 68910024.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269166 + ... + 269321.

It is an arithmetic number, because the mean of its divisors is an integer number (5654124).

Almost surely, 2^42001986 is an apocalyptic number.

42001986 is an abundant number, since it is smaller than the sum of its proper divisors (48463998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42001986 is a wasteful number, since it uses less digits than its factorization.

42001986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538505.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 42001986 is about 6480.8939198231. The cubic root of 42001986 is about 347.6081432824.

The spelling of 42001986 in words is "forty-two million, one thousand, nine hundred eighty-six".