1271298840 has 128 divisors (see below), whose sum is σ = 4499435520. Its totient is φ = 281203200.

The previous prime is 1271298773. The next prime is 1271298851. The reversal of 1271298840 is 488921721.

1271298840 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1271298792 and 1271298801.

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, 1630 + ... + 50450.

It is an arithmetic number, because the mean of its divisors is an integer number (35151840).

Almost surely, 2^1271298840 is an apocalyptic number.

1271298840 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 1271298840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2249717760).

1271298840 is an abundant number, since it is smaller than the sum of its proper divisors (3228136680).

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

1271298840 is a wasteful number, since it uses less digits than its factorization.

1271298840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48873 (or 48869 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 1271298840 is about 35655.2778701835. The cubic root of 1271298840 is about 1083.3011817414.

The spelling of 1271298840 in words is "one billion, two hundred seventy-one million, two hundred ninety-eight thousand, eight hundred forty".