261958738 has 8 divisors (see below), whose sum is σ = 413619120. Its totient is φ = 124085700.

The previous prime is 261958733. The next prime is 261958813. The reversal of 261958738 is 837859162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 261958691 and 261958700.

It is not an unprimeable number, because it can be changed into a prime (261958733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446788 + ... + 3446863.

It is an arithmetic number, because the mean of its divisors is an integer number (51702390).

Almost surely, 2^261958738 is an apocalyptic number.

261958738 is a deficient number, since it is larger than the sum of its proper divisors (151660382).

261958738 is a wasteful number, since it uses less digits than its factorization.

261958738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6893672.

The product of its digits is 725760, while the sum is 49.

The square root of 261958738 is about 16185.1394186148. The cubic root of 261958738 is about 639.8491978680.

The spelling of 261958738 in words is "two hundred sixty-one million, nine hundred fifty-eight thousand, seven hundred thirty-eight".