1261160388 has 48 divisors (see below), whose sum is σ = 3272290560. Its totient is φ = 420050592.

The previous prime is 1261160377. The next prime is 1261160389. The reversal of 1261160388 is 8830611621.

1261160388 is a `hidden beast` number, since 1 + 2 + 611 + 6 + 0 + 38 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1261160389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156670 + ... + 164522.

It is an arithmetic number, because the mean of its divisors is an integer number (68172720).

Almost surely, 2^1261160388 is an apocalyptic number.

1261160388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1261160388 is an abundant number, since it is smaller than the sum of its proper divisors (2011130172).

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

1261160388 is a wasteful number, since it uses less digits than its factorization.

1261160388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9353 (or 9345 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1261160388 is about 35512.8200513561. The cubic root of 1261160388 is about 1080.4137612159.

The spelling of 1261160388 in words is "one billion, two hundred sixty-one million, one hundred sixty thousand, three hundred eighty-eight".