268436381 has 4 divisors (see below), whose sum is σ = 280107552. Its totient is φ = 256765212.

The previous prime is 268436327. The next prime is 268436407. The reversal of 268436381 is 183634862.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 183634862 = 2 ⋅91817431.

It is a cyclic number.

It is not a de Polignac number, because 268436381 - 2²⁶ = 201327517 is a prime.

It is a super-2 number, since 2×268436381² = 144116181288754322, 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 (268436081) 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, 5835551 + ... + 5835596.

It is an arithmetic number, because the mean of its divisors is an integer number (70026888).

Almost surely, 2^268436381 is an apocalyptic number.

It is an amenable number.

268436381 is a deficient number, since it is larger than the sum of its proper divisors (11671171).

268436381 is a wasteful number, since it uses less digits than its factorization.

268436381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671170.

The product of its digits is 165888, while the sum is 41.

The square root of 268436381 is about 16384.0282287354. The cubic root of 268436381 is about 645.0803185038.

The spelling of 268436381 in words is "two hundred sixty-eight million, four hundred thirty-six thousand, three hundred eighty-one".