261422340 has 96 divisors (see below), whose sum is σ = 746444160. Its totient is φ = 68352000.

The previous prime is 261422309. The next prime is 261422377. The reversal of 261422340 is 43224162.

It is a self number, because there is not a number n which added to its sum of digits gives 261422340.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1084620 + ... + 1084860.

It is an arithmetic number, because the mean of its divisors is an integer number (7775460).

Almost surely, 2^261422340 is an apocalyptic number.

261422340 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 261422340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (373222080).

261422340 is an abundant number, since it is smaller than the sum of its proper divisors (485021820).

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

261422340 is a wasteful number, since it uses less digits than its factorization.

261422340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 261422340 is about 16168.5602327480. The cubic root of 261422340 is about 639.4121718446.

It can be divided in two parts, 26142 and 2340, that added together give a palindrome (28482).

The spelling of 261422340 in words is "two hundred sixty-one million, four hundred twenty-two thousand, three hundred forty".