261830540 has 12 divisors (see below), whose sum is σ = 549844176. Its totient is φ = 104732208.

The previous prime is 261830521. The next prime is 261830563. The reversal of 261830540 is 45038162.

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, 6545744 + ... + 6545783.

It is an arithmetic number, because the mean of its divisors is an integer number (45820348).

Almost surely, 2^261830540 is an apocalyptic number.

261830540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261830540 is an abundant number, since it is smaller than the sum of its proper divisors (288013636).

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

261830540 is a wasteful number, since it uses less digits than its factorization.

261830540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13091536 (or 13091534 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 261830540 is about 16181.1785726504. The cubic root of 261830540 is about 639.7448038546.

The spelling of 261830540 in words is "two hundred sixty-one million, eight hundred thirty thousand, five hundred forty".