261384040 has 16 divisors (see below), whose sum is σ = 588114180. Its totient is φ = 104553600.

The previous prime is 261384037. The next prime is 261384041. The reversal of 261384040 is 40483162.

It can be written as a sum of positive squares in 2 ways, for example, as 254530116 + 6853924 = 15954^2 + 2618^2 .

It is not an unprimeable number, because it can be changed into a prime (261384041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3267261 + ... + 3267340.

Almost surely, 2^261384040 is an apocalyptic number.

261384040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261384040 is an abundant number, since it is smaller than the sum of its proper divisors (326730140).

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

261384040 is a wasteful number, since it uses less digits than its factorization.

261384040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6534612 (or 6534608 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 261384040 is about 16167.3757920078. The cubic root of 261384040 is about 639.3809443651.

The spelling of 261384040 in words is "two hundred sixty-one million, three hundred eighty-four thousand, forty".