261723944 has 8 divisors (see below), whose sum is σ = 490732410. Its totient is φ = 130861968.

The previous prime is 261723937. The next prime is 261723949. The reversal of 261723944 is 449327162.

It can be written as a sum of positive squares in only one way, i.e., 238084900 + 23639044 = 15430^2 + 4862^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 261723898 and 261723907.

It is not an unprimeable number, because it can be changed into a prime (261723949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16357739 + ... + 16357754.

Almost surely, 2^261723944 is an apocalyptic number.

It is an amenable number.

261723944 is a deficient number, since it is larger than the sum of its proper divisors (229008466).

261723944 is a wasteful number, since it uses less digits than its factorization.

261723944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32715499 (or 32715495 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 261723944 is about 16177.8844105155. The cubic root of 261723944 is about 639.6579748015.

The spelling of 261723944 in words is "two hundred sixty-one million, seven hundred twenty-three thousand, nine hundred forty-four".