261323400 has 96 divisors (see below), whose sum is σ = 872444160. Its totient is φ = 64323840.

The previous prime is 261323399. The next prime is 261323423. The reversal of 261323400 is 4323162.

It is a happy number.

261323400 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8952 + ... + 24551.

It is an arithmetic number, because the mean of its divisors is an integer number (9087960).

Almost surely, 2^261323400 is an apocalyptic number.

261323400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261323400 is an abundant number, since it is smaller than the sum of its proper divisors (611120760).

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

261323400 is a wasteful number, since it uses less digits than its factorization.

261323400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33535 (or 33526 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 261323400 is about 16165.5003015682. The cubic root of 261323400 is about 639.3314959760.

Adding to 261323400 its reverse (4323162), we get a palindrome (265646562).

The spelling of 261323400 in words is "two hundred sixty-one million, three hundred twenty-three thousand, four hundred".