268906138 has 4 divisors (see below), whose sum is σ = 403359210. Its totient is φ = 134453068.

The previous prime is 268906123. The next prime is 268906147. The reversal of 268906138 is 831609862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 178142409 + 90763729 = 13347^2 + 9527^2 .

It is a super-2 number, since 2×268906138² = 144621022108150088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 268906094 and 268906103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67226533 + ... + 67226536.

Almost surely, 2^268906138 is an apocalyptic number.

268906138 is a deficient number, since it is larger than the sum of its proper divisors (134453072).

268906138 is a wasteful number, since it uses less digits than its factorization.

268906138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134453071.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 268906138 is about 16398.3577836319. The cubic root of 268906138 is about 645.4563907289.

The spelling of 268906138 in words is "two hundred sixty-eight million, nine hundred six thousand, one hundred thirty-eight".