1291253790 has 16 divisors (see below), whose sum is σ = 3099009168. Its totient is φ = 344334336.

The previous prime is 1291253779. The next prime is 1291253807. The reversal of 1291253790 is 973521921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21520867 + ... + 21520926.

It is an arithmetic number, because the mean of its divisors is an integer number (193688073).

Almost surely, 2^1291253790 is an apocalyptic number.

1291253790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291253790 is an abundant number, since it is smaller than the sum of its proper divisors (1807755378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291253790 is a wasteful number, since it uses less digits than its factorization.

1291253790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43041803.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 1291253790 is about 35934.0199532421. The cubic root of 1291253790 is about 1088.9397962031.

The spelling of 1291253790 in words is "one billion, two hundred ninety-one million, two hundred fifty-three thousand, seven hundred ninety".