1268209156 has 12 divisors (see below), whose sum is σ = 2224183500. Its totient is φ = 632728160.

The previous prime is 1268209153. The next prime is 1268209177. The reversal of 1268209156 is 6519028621.

It can be written as a sum of positive squares in 2 ways, for example, as 360392256 + 907816900 = 18984^2 + 30130^2 .

It is not an unprimeable number, because it can be changed into a prime (1268209153) 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, 342031 + ... + 345718.

It is an arithmetic number, because the mean of its divisors is an integer number (185348625).

Almost surely, 2^1268209156 is an apocalyptic number.

It is an amenable number.

1268209156 is a deficient number, since it is larger than the sum of its proper divisors (955974344).

1268209156 is a wasteful number, since it uses less digits than its factorization.

1268209156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688214 (or 688212 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 1268209156 is about 35611.9243512619. The cubic root of 1268209156 is about 1082.4228743541.

The spelling of 1268209156 in words is "one billion, two hundred sixty-eight million, two hundred nine thousand, one hundred fifty-six".