261286140 has 48 divisors (see below), whose sum is σ = 733991328. Its totient is φ = 69448704.

The previous prime is 261286133. The next prime is 261286147. The reversal of 261286140 is 41682162.

261286140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261286133) and next prime (261286147).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 261286098 and 261286107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261286147) by changing a digit.

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, 11824 + ... + 25736.

It is an arithmetic number, because the mean of its divisors is an integer number (15291486).

Almost surely, 2^261286140 is an apocalyptic number.

261286140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261286140 is an abundant number, since it is smaller than the sum of its proper divisors (472705188).

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

261286140 is a wasteful number, since it uses less digits than its factorization.

261286140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14238 (or 14236 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 261286140 is about 16164.3478062061. The cubic root of 261286140 is about 639.3011088212.

The spelling of 261286140 in words is "two hundred sixty-one million, two hundred eighty-six thousand, one hundred forty".