268986921 has 12 divisors (see below), whose sum is σ = 417204432. Its totient is φ = 153706728.

The previous prime is 268986871. The next prime is 268986923. The reversal of 268986921 is 129689862.

It is not a de Polignac number, because 268986921 - 2¹³ = 268978729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (268986923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 914775 + ... + 915068.

It is an arithmetic number, because the mean of its divisors is an integer number (34767036).

Almost surely, 2^268986921 is an apocalyptic number.

268986921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

268986921 is a deficient number, since it is larger than the sum of its proper divisors (148217511).

268986921 is a wasteful number, since it uses less digits than its factorization.

268986921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829860 (or 1829853 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 268986921 is about 16400.8207416580. The cubic root of 268986921 is about 645.5210188348.

The spelling of 268986921 in words is "two hundred sixty-eight million, nine hundred eighty-six thousand, nine hundred twenty-one".