261404118 has 32 divisors (see below), whose sum is σ = 589576320. Its totient is φ = 85833000.

The previous prime is 261404113. The next prime is 261404119. The reversal of 261404118 is 811404162.

It is a happy number.

261404118 is a `hidden beast` number, since 2 + 614 + 0 + 41 + 1 + 8 = 666.

It is a super-2 number, since 2×261404118² = 136664225814715848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 261404091 and 261404100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261404113) 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, 32508 + ... + 39743.

It is an arithmetic number, because the mean of its divisors is an integer number (18424260).

Almost surely, 2^261404118 is an apocalyptic number.

261404118 is an abundant number, since it is smaller than the sum of its proper divisors (328172202).

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

261404118 is a wasteful number, since it uses less digits than its factorization.

261404118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72329 (or 72323 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 261404118 is about 16167.9967219195. The cubic root of 261404118 is about 639.3973151197.

The spelling of 261404118 in words is "two hundred sixty-one million, four hundred four thousand, one hundred eighteen".