139999881 has 16 divisors (see below), whose sum is σ = 215224704. Its totient is φ = 79290624.

The previous prime is 139999841. The next prime is 139999901. The reversal of 139999881 is 188999931.

It is not a de Polignac number, because 139999881 - 2¹⁰ = 139998857 is a prime.

It is a super-2 number, since 2×139999881² = 39199933360028322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139999841) 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, 27126 + ... + 31871.

It is an arithmetic number, because the mean of its divisors is an integer number (13451544).

Almost surely, 2^139999881 is an apocalyptic number.

It is an amenable number.

139999881 is a deficient number, since it is larger than the sum of its proper divisors (75224823).

139999881 is a wasteful number, since it uses less digits than its factorization.

139999881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59120.

The product of its digits is 1259712, while the sum is 57.

The square root of 139999881 is about 11832.1545375303. The cubic root of 139999881 is about 519.2492630644.

Subtracting 139999881 from its reverse (188999931), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 139999881 in words is "one hundred thirty-nine million, nine hundred ninety-nine thousand, eight hundred eighty-one".