139541986 has 8 divisors (see below), whose sum is σ = 210911184. Its totient is φ = 69238260.

The previous prime is 139541981. The next prime is 139541999. The reversal of 139541986 is 689145931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (139541981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266040 + ... + 266563.

It is an arithmetic number, because the mean of its divisors is an integer number (26363898).

Almost surely, 2^139541986 is an apocalyptic number.

139541986 is a deficient number, since it is larger than the sum of its proper divisors (71369198).

139541986 is a wasteful number, since it uses less digits than its factorization.

139541986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532736.

The product of its digits is 233280, while the sum is 46.

The square root of 139541986 is about 11812.7890864097. The cubic root of 139541986 is about 518.6825451362.

The spelling of 139541986 in words is "one hundred thirty-nine million, five hundred forty-one thousand, nine hundred eighty-six".