1268871893 has 4 divisors (see below), whose sum is σ = 1269003948. Its totient is φ = 1268739840.

The previous prime is 1268871853. The next prime is 1268871917. The reversal of 1268871893 is 3981788621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 513611569 + 755260324 = 22663^2 + 27482^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268871893 - 2¹² = 1268867797 is a prime.

It is a super-2 number, since 2×1268871893² = 3220071761690806898, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268871853) 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, 50378 + ... + 71243.

It is an arithmetic number, because the mean of its divisors is an integer number (317250987).

Almost surely, 2^1268871893 is an apocalyptic number.

It is an amenable number.

1268871893 is a deficient number, since it is larger than the sum of its proper divisors (132055).

1268871893 is a wasteful number, since it uses less digits than its factorization.

1268871893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132054.

The product of its digits is 1161216, while the sum is 53.

The square root of 1268871893 is about 35621.2281231291. The cubic root of 1268871893 is about 1082.6113913040.

The spelling of 1268871893 in words is "one billion, two hundred sixty-eight million, eight hundred seventy-one thousand, eight hundred ninety-three".