1271791404 has 144 divisors (see below), whose sum is σ = 3627842400. Its totient is φ = 372943872.

The previous prime is 1271791397. The next prime is 1271791421. The reversal of 1271791404 is 4041971721.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1125912 + ... + 1127040.

It is an arithmetic number, because the mean of its divisors is an integer number (25193350).

Almost surely, 2^1271791404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1271791404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1813921200).

1271791404 is an abundant number, since it is smaller than the sum of its proper divisors (2356050996).

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

1271791404 is a wasteful number, since it uses less digits than its factorization.

1271791404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264 (or 1259 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 1271791404 is about 35662.1845096455. The cubic root of 1271791404 is about 1083.4410718149.

The spelling of 1271791404 in words is "one billion, two hundred seventy-one million, seven hundred ninety-one thousand, four hundred four".