261404140 has 12 divisors (see below), whose sum is σ = 548948736. Its totient is φ = 104561648.

The previous prime is 261404137. The next prime is 261404197. The reversal of 261404140 is 41404162.

261404140 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6535084 + ... + 6535123.

It is an arithmetic number, because the mean of its divisors is an integer number (45745728).

Almost surely, 2^261404140 is an apocalyptic number.

261404140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261404140 is an abundant number, since it is smaller than the sum of its proper divisors (287544596).

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

261404140 is a wasteful number, since it uses less digits than its factorization.

261404140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13070216 (or 13070214 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 261404140 is about 16167.9974022759. The cubic root of 261404140 is about 639.3973330571.

Adding to 261404140 its sum of digits (22), we get a palindrome (261404162).

The spelling of 261404140 in words is "two hundred sixty-one million, four hundred four thousand, one hundred forty".