261960984 has 48 divisors (see below), whose sum is σ = 740329200. Its totient is φ = 83523264.

The previous prime is 261960971. The next prime is 261960989. The reversal of 261960984 is 489069162.

It is a happy number.

261960984 is a `hidden beast` number, since 26 + 19 + 609 + 8 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261960989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77439 + ... + 80750.

It is an arithmetic number, because the mean of its divisors is an integer number (15423525).

Almost surely, 2^261960984 is an apocalyptic number.

261960984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261960984 is an abundant number, since it is smaller than the sum of its proper divisors (478368216).

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

261960984 is a wasteful number, since it uses less digits than its factorization.

261960984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158224 (or 158217 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 261960984 is about 16185.2088031017. The cubic root of 261960984 is about 639.8510265239.

The spelling of 261960984 in words is "two hundred sixty-one million, nine hundred sixty thousand, nine hundred eighty-four".