1261346540 has 24 divisors (see below), whose sum is σ = 2788240560. Its totient is φ = 477983808.

The previous prime is 1261346531. The next prime is 1261346543. The reversal of 1261346540 is 456431621.

It is a junction number, because it is equal to n+sod(n) for n = 1261346497 and 1261346506.

It is not an unprimeable number, because it can be changed into a prime (1261346543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1659287 + ... + 1660046.

It is an arithmetic number, because the mean of its divisors is an integer number (116176690).

Almost surely, 2^1261346540 is an apocalyptic number.

1261346540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261346540 is an abundant number, since it is smaller than the sum of its proper divisors (1526894020).

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

1261346540 is a wasteful number, since it uses less digits than its factorization.

1261346540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319361 (or 3319359 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1261346540 is about 35515.4408673185. The cubic root of 1261346540 is about 1080.4669163075.

The spelling of 1261346540 in words is "one billion, two hundred sixty-one million, three hundred forty-six thousand, five hundred forty".