261372140 has 12 divisors (see below), whose sum is σ = 548881536. Its totient is φ = 104548848.

The previous prime is 261372121. The next prime is 261372169. The reversal of 261372140 is 41273162.

261372140 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

261372140 is strictly pandigital in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6534284 + ... + 6534323.

It is an arithmetic number, because the mean of its divisors is an integer number (45740128).

Almost surely, 2^261372140 is an apocalyptic number.

261372140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261372140 is an abundant number, since it is smaller than the sum of its proper divisors (287509396).

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

261372140 is a wasteful number, since it uses less digits than its factorization.

261372140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13068616 (or 13068614 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 261372140 is about 16167.0077627247. The cubic root of 261372140 is about 639.3712412112.

The spelling of 261372140 in words is "two hundred sixty-one million, three hundred seventy-two thousand, one hundred forty".