139334381 has 4 divisors (see below), whose sum is σ = 139403232. Its totient is φ = 139265532.

The previous prime is 139334323. The next prime is 139334387. The reversal of 139334381 is 183433931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139334381 - 2¹⁰ = 139333357 is a prime.

It is a super-2 number, since 2×139334381² = 38828139457306322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139334387) 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, 31295 + ... + 35468.

It is an arithmetic number, because the mean of its divisors is an integer number (34850808).

Almost surely, 2^139334381 is an apocalyptic number.

It is an amenable number.

139334381 is a deficient number, since it is larger than the sum of its proper divisors (68851).

139334381 is an equidigital number, since it uses as much as digits as its factorization.

139334381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68850.

The product of its digits is 23328, while the sum is 35.

The square root of 139334381 is about 11803.9985174516. The cubic root of 139334381 is about 518.4251924013.

Adding to 139334381 its sum of digits (35), we get a square (139334416 = 11804²).

The spelling of 139334381 in words is "one hundred thirty-nine million, three hundred thirty-four thousand, three hundred eighty-one".