139423771 has 4 divisors (see below), whose sum is σ = 143921344. Its totient is φ = 134926200.

The previous prime is 139423763. The next prime is 139423789. The reversal of 139423771 is 177324931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177324931 = 7 ⋅25332133.

It is a cyclic number.

It is not a de Polignac number, because 139423771 - 2³ = 139423763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139423771.

It is not an unprimeable number, because it can be changed into a prime (139423721) 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, 2248740 + ... + 2248801.

It is an arithmetic number, because the mean of its divisors is an integer number (35980336).

Almost surely, 2^139423771 is an apocalyptic number.

139423771 is a deficient number, since it is larger than the sum of its proper divisors (4497573).

139423771 is an equidigital number, since it uses as much as digits as its factorization.

139423771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4497572.

The product of its digits is 31752, while the sum is 37.

The square root of 139423771 is about 11807.7843391553. The cubic root of 139423771 is about 518.5360339632.

The spelling of 139423771 in words is "one hundred thirty-nine million, four hundred twenty-three thousand, seven hundred seventy-one".