139919381 has 8 divisors (see below), whose sum is σ = 159985920. Its totient is φ = 119872368.

The previous prime is 139919369. The next prime is 139919389. The reversal of 139919381 is 183919931.

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

It is not a de Polignac number, because 139919381 - 2⁶ = 139919317 is a prime.

It is a super-2 number, since 2×139919381² = 39154866358846322, 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 (139919389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17075 + ... + 23903.

It is an arithmetic number, because the mean of its divisors is an integer number (19998240).

Almost surely, 2^139919381 is an apocalyptic number.

It is an amenable number.

139919381 is a deficient number, since it is larger than the sum of its proper divisors (20066539).

139919381 is an equidigital number, since it uses as much as digits as its factorization.

139919381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9763.

The product of its digits is 52488, while the sum is 44.

The square root of 139919381 is about 11828.7523010671. The cubic root of 139919381 is about 519.1497211231.

The spelling of 139919381 in words is "one hundred thirty-nine million, nine hundred nineteen thousand, three hundred eighty-one".