261963746 has 16 divisors (see below), whose sum is σ = 428977728. Its totient is φ = 118988400.

The previous prime is 261963731. The next prime is 261963749. The reversal of 261963746 is 647369162.

It is a junction number, because it is equal to n+sod(n) for n = 261963697 and 261963706.

It is not an unprimeable number, because it can be changed into a prime (261963749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34691 + ... + 41561.

It is an arithmetic number, because the mean of its divisors is an integer number (26811108).

Almost surely, 2^261963746 is an apocalyptic number.

261963746 is a deficient number, since it is larger than the sum of its proper divisors (167013982).

261963746 is a wasteful number, since it uses less digits than its factorization.

261963746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8617.

The product of its digits is 326592, while the sum is 44.

The square root of 261963746 is about 16185.2941276951. The cubic root of 261963746 is about 639.8532752841.

The spelling of 261963746 in words is "two hundred sixty-one million, nine hundred sixty-three thousand, seven hundred forty-six".