1265290388 has 6 divisors (see below), whose sum is σ = 2214258186. Its totient is φ = 632645192.

The previous prime is 1265290379. The next prime is 1265290391. The reversal of 1265290388 is 8830925621.

It can be written as a sum of positive squares in only one way, i.e., 796481284 + 468809104 = 28222^2 + 21652^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158161295 + ... + 158161302.

It is an arithmetic number, because the mean of its divisors is an integer number (369043031).

Almost surely, 2^1265290388 is an apocalyptic number.

It is an amenable number.

1265290388 is a deficient number, since it is larger than the sum of its proper divisors (948967798).

1265290388 is a wasteful number, since it uses less digits than its factorization.

1265290388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316322601 (or 316322599 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 1265290388 is about 35570.9205391145. The cubic root of 1265290388 is about 1081.5918421158.

The spelling of 1265290388 in words is "one billion, two hundred sixty-five million, two hundred ninety thousand, three hundred eighty-eight".