1270947640 has 32 divisors (see below), whose sum is σ = 2887954560. Its totient is φ = 503344000.

The previous prime is 1270947637. The next prime is 1270947661. The reversal of 1270947640 is 467490721.

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 = 1270947593 and 1270947602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153256 + ... + 161335.

It is an arithmetic number, because the mean of its divisors is an integer number (90248580).

Almost surely, 2^1270947640 is an apocalyptic number.

1270947640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1270947640 is an abundant number, since it is smaller than the sum of its proper divisors (1617006920).

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

1270947640 is a wasteful number, since it uses less digits than its factorization.

1270947640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314703 (or 314699 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 1270947640 is about 35650.3525929268. The cubic root of 1270947640 is about 1083.2014175206.

The spelling of 1270947640 in words is "one billion, two hundred seventy million, nine hundred forty-seven thousand, six hundred forty".