1271863480 has 16 divisors (see below), whose sum is σ = 2861692920. Its totient is φ = 508745376.

The previous prime is 1271863441. The next prime is 1271863513. The reversal of 1271863480 is 843681721.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 31796587 = 1271863480 / (1 + 2 + 7 + 1 + 8 + 6 + 3 + 4 + 8 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15898254 + ... + 15898333.

Almost surely, 2^1271863480 is an apocalyptic number.

1271863480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271863480 is an abundant number, since it is smaller than the sum of its proper divisors (1589829440).

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

1271863480 is a wasteful number, since it uses less digits than its factorization.

1271863480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31796598 (or 31796594 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1271863480 is about 35663.1950335356. The cubic root of 1271863480 is about 1083.4615386470.

The spelling of 1271863480 in words is "one billion, two hundred seventy-one million, eight hundred sixty-three thousand, four hundred eighty".