261389104 has 20 divisors (see below), whose sum is σ = 518794920. Its totient is φ = 127506560.

The previous prime is 261389069. The next prime is 261389113. The reversal of 261389104 is 401983162.

It is a self number, because there is not a number n which added to its sum of digits gives 261389104.

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, 198574 + ... + 199885.

It is an arithmetic number, because the mean of its divisors is an integer number (25939746).

Almost surely, 2^261389104 is an apocalyptic number.

It is an amenable number.

261389104 is a deficient number, since it is larger than the sum of its proper divisors (257405816).

261389104 is a wasteful number, since it uses less digits than its factorization.

261389104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398508 (or 398502 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 261389104 is about 16167.5324029364. The cubic root of 261389104 is about 639.3850734163.

The spelling of 261389104 in words is "two hundred sixty-one million, three hundred eighty-nine thousand, one hundred four".