261984838 has 4 divisors (see below), whose sum is σ = 392977260. Its totient is φ = 130992418.

The previous prime is 261984829. The next prime is 261984851. The reversal of 261984838 is 838489162.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 261984791 and 261984800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65496208 + ... + 65496211.

It is an arithmetic number, because the mean of its divisors is an integer number (98244315).

Almost surely, 2^261984838 is an apocalyptic number.

261984838 is a deficient number, since it is larger than the sum of its proper divisors (130992422).

261984838 is a wasteful number, since it uses less digits than its factorization.

261984838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130992421.

The product of its digits is 663552, while the sum is 49.

The square root of 261984838 is about 16185.9456937184. The cubic root of 261984838 is about 639.8704474098.

The spelling of 261984838 in words is "two hundred sixty-one million, nine hundred eighty-four thousand, eight hundred thirty-eight".