1271101440 has 384 divisors, whose sum is σ = 4868398080. Its totient is φ = 276824064.

The previous prime is 1271101439. The next prime is 1271101453. The reversal of 1271101440 is 441011721.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4945792 + ... + 4946048.

It is an arithmetic number, because the mean of its divisors is an integer number (12678120).

Almost surely, 2^1271101440 is an apocalyptic number.

1271101440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1271101440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2434199040).

1271101440 is an abundant number, since it is smaller than the sum of its proper divisors (3597296640).

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

1271101440 is a wasteful number, since it uses less digits than its factorization.

1271101440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1271101440 is about 35652.5095890878. The cubic root of 1271101440 is about 1083.2451092388.

The spelling of 1271101440 in words is "one billion, two hundred seventy-one million, one hundred one thousand, four hundred forty".