139303881 has 14 divisors (see below), whose sum is σ = 208861370. Its totient is φ = 92868768.

The previous prime is 139303873. The next prime is 139303883. The reversal of 139303881 is 188303931.

139303881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 136679481 + 2624400 = 11691^2 + 1620^2 .

It is not a de Polignac number, because 139303881 - 2³ = 139303873 is a prime.

It is a super-2 number, since 2×139303881² = 38811142523324322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (139303883) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 94816 + ... + 96273.

Almost surely, 2^139303881 is an apocalyptic number.

It is an amenable number.

139303881 is a deficient number, since it is larger than the sum of its proper divisors (69557489).

139303881 is an frugal number, since it uses more digits than its factorization.

139303881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191107 (or 191092 counting only the distinct ones).

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

The square root of 139303881 is about 11802.7065116438. The cubic root of 139303881 is about 518.3873622498.

Subtracting 139303881 from its reverse (188303931), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 139303881 in words is "one hundred thirty-nine million, three hundred three thousand, eight hundred eighty-one".