1271849840 has 40 divisors (see below), whose sum is σ = 3036978240. Its totient is φ = 494989056.

The previous prime is 1271849801. The next prime is 1271849857. The reversal of 1271849840 is 489481721.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1271849791 and 1271849800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211880 + ... + 217799.

It is an arithmetic number, because the mean of its divisors is an integer number (75924456).

Almost surely, 2^1271849840 is an apocalyptic number.

1271849840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271849840 is an abundant number, since it is smaller than the sum of its proper divisors (1765128400).

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

1271849840 is a wasteful number, since it uses less digits than its factorization.

1271849840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429729 (or 429723 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 1271849840 is about 35663.0037994558. The cubic root of 1271849840 is about 1083.4576654671.

The spelling of 1271849840 in words is "one billion, two hundred seventy-one million, eight hundred forty-nine thousand, eight hundred forty".