261485830 has 8 divisors (see below), whose sum is σ = 470674512. Its totient is φ = 104594328.

The previous prime is 261485797. The next prime is 261485831. The reversal of 261485830 is 38584162.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 261485830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261485831) 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, 13074282 + ... + 13074301.

It is an arithmetic number, because the mean of its divisors is an integer number (58834314).

Almost surely, 2^261485830 is an apocalyptic number.

261485830 is a deficient number, since it is larger than the sum of its proper divisors (209188682).

261485830 is a wasteful number, since it uses less digits than its factorization.

261485830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26148590.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 261485830 is about 16170.5234918354. The cubic root of 261485830 is about 639.4639309926.

The spelling of 261485830 in words is "two hundred sixty-one million, four hundred eighty-five thousand, eight hundred thirty".