268139 has 4 divisors (see below), whose sum is σ = 275424. Its totient is φ = 260856.

The previous prime is 268133. The next prime is 268153. The reversal of 268139 is 931862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931862 = 2 ⋅465931.

It is a cyclic number.

It is not a de Polignac number, because 268139 - 2⁴ = 268123 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 268139.

It is not an unprimeable number, because it can be changed into a prime (268133) 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, 3587 + ... + 3660.

It is an arithmetic number, because the mean of its divisors is an integer number (68856).

2²⁶⁸¹³⁹ is an apocalyptic number.

268139 is a deficient number, since it is larger than the sum of its proper divisors (7285).

268139 is an equidigital number, since it uses as much as digits as its factorization.

268139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7284.

The product of its digits is 2592, while the sum is 29.

The square root of 268139 is about 517.8213977811. The cubic root of 268139 is about 64.4842018076.

The spelling of 268139 in words is "two hundred sixty-eight thousand, one hundred thirty-nine".