261443300 has 72 divisors (see below), whose sum is σ = 600711552. Its totient is φ = 98560000.

The previous prime is 261443291. The next prime is 261443317. The reversal of 261443300 is 3344162.

It is a happy number.

It is a super-2 number, since 2×261443300² = 136705198229780000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 162500 + ... + 164100.

It is an arithmetic number, because the mean of its divisors is an integer number (8343216).

Almost surely, 2^261443300 is an apocalyptic number.

261443300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261443300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300355776).

261443300 is an abundant number, since it is smaller than the sum of its proper divisors (339268252).

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

261443300 is a wasteful number, since it uses less digits than its factorization.

261443300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 261443300 is about 16169.2083912602. The cubic root of 261443300 is about 639.4292600564.

Adding to 261443300 its reverse (3344162), we get a palindrome (264787462).

The spelling of 261443300 in words is "two hundred sixty-one million, four hundred forty-three thousand, three hundred".