261862906 has 8 divisors (see below), whose sum is σ = 394768800. Its totient is φ = 130273308.

The previous prime is 261862903. The next prime is 261862907. The reversal of 261862906 is 609268162.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (261862901) 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, 328576 + ... + 329371.

It is an arithmetic number, because the mean of its divisors is an integer number (49346100).

Almost surely, 2^261862906 is an apocalyptic number.

261862906 is a deficient number, since it is larger than the sum of its proper divisors (132905894).

261862906 is a wasteful number, since it uses less digits than its factorization.

261862906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658148.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 261862906 is about 16182.1786543098. The cubic root of 261862906 is about 639.7711633047.

It can be divided in two parts, 26186 and 2906, that added together give a palindrome (29092).

The spelling of 261862906 in words is "two hundred sixty-one million, eight hundred sixty-two thousand, nine hundred six".