1261076940 has 36 divisors (see below), whose sum is σ = 3825267264. Its totient is φ = 336287136.

The previous prime is 1261076933. The next prime is 1261076969. The reversal of 1261076940 is 496701621.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1261076895 and 1261076904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3502812 + ... + 3503171.

It is an arithmetic number, because the mean of its divisors is an integer number (106257424).

Almost surely, 2^1261076940 is an apocalyptic number.

1261076940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261076940 is an abundant number, since it is smaller than the sum of its proper divisors (2564190324).

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

1261076940 is a wasteful number, since it uses less digits than its factorization.

1261076940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7005998 (or 7005993 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1261076940 is about 35511.6451322661. The cubic root of 1261076940 is about 1080.3899312159.

The spelling of 1261076940 in words is "one billion, two hundred sixty-one million, seventy-six thousand, nine hundred forty".