139427 has 4 divisors (see below), whose sum is σ = 141576. Its totient is φ = 137280.

The previous prime is 139423. The next prime is 139429. The reversal of 139427 is 724931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724931 = 17 ⋅42643.

It is a cyclic number.

It is not a de Polignac number, because 139427 - 2² = 139423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139396 and 139405.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139427.

It is not an unprimeable number, because it can be changed into a prime (139423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974 + ... + 1107.

It is an arithmetic number, because the mean of its divisors is an integer number (35394).

2¹³⁹⁴²⁷ is an apocalyptic number.

139427 is a deficient number, since it is larger than the sum of its proper divisors (2149).

139427 is an equidigital number, since it uses as much as digits as its factorization.

139427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148.

The product of its digits is 1512, while the sum is 26.

The square root of 139427 is about 373.3992501332. The cubic root of 139427 is about 51.8540036963.

The spelling of 139427 in words is "one hundred thirty-nine thousand, four hundred twenty-seven".