1271869240 has 128 divisors (see below), whose sum is σ = 3092774400. Its totient is φ = 469647360.

The previous prime is 1271869223. The next prime is 1271869267. The reversal of 1271869240 is 429681721.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1271869193 and 1271869202.

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, 4063324 + ... + 4063636.

It is an arithmetic number, because the mean of its divisors is an integer number (24162300).

Almost surely, 2^1271869240 is an apocalyptic number.

1271869240 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 1271869240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1546387200).

1271869240 is an abundant number, since it is smaller than the sum of its proper divisors (1820905160).

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

1271869240 is a wasteful number, since it uses less digits than its factorization.

1271869240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1271869240 is about 35663.2757889681. The cubic root of 1271869240 is about 1083.4631742337.

The spelling of 1271869240 in words is "one billion, two hundred seventy-one million, eight hundred sixty-nine thousand, two hundred forty".