261384830 has 32 divisors (see below), whose sum is σ = 556251840. Its totient is φ = 86526720.

The previous prime is 261384821. The next prime is 261384847. The reversal of 261384830 is 38483162.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62351 + ... + 66410.

It is an arithmetic number, because the mean of its divisors is an integer number (17382870).

Almost surely, 2^261384830 is an apocalyptic number.

261384830 is an abundant number, since it is smaller than the sum of its proper divisors (294867010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261384830 is a wasteful number, since it uses less digits than its factorization.

261384830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128804.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 261384830 is about 16167.4002239074. The cubic root of 261384830 is about 639.3815885137.

The spelling of 261384830 in words is "two hundred sixty-one million, three hundred eighty-four thousand, eight hundred thirty".