139941987 has 8 divisors (see below), whose sum is σ = 187186704. Its totient is φ = 92995968.

The previous prime is 139941953. The next prime is 139942001. The reversal of 139941987 is 789149931.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-139941987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139941587) 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 7 ways as a sum of consecutive naturals, for example, 73578 + ... + 75455.

It is an arithmetic number, because the mean of its divisors is an integer number (23398338).

Almost surely, 2^139941987 is an apocalyptic number.

139941987 is a deficient number, since it is larger than the sum of its proper divisors (47244717).

139941987 is a wasteful number, since it uses less digits than its factorization.

139941987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149349.

The product of its digits is 489888, while the sum is 51.

The square root of 139941987 is about 11829.7078154957. The cubic root of 139941987 is about 519.1776783332.

The spelling of 139941987 in words is "one hundred thirty-nine million, nine hundred forty-one thousand, nine hundred eighty-seven".