261338936 has 8 divisors (see below), whose sum is σ = 490010520. Its totient is φ = 130669464.

The previous prime is 261338929. The next prime is 261338947. The reversal of 261338936 is 639833162.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×261338936² = 136596078939224192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261338893 and 261338902.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16333676 + ... + 16333691.

It is an arithmetic number, because the mean of its divisors is an integer number (61251315).

Almost surely, 2^261338936 is an apocalyptic number.

It is an amenable number.

261338936 is a deficient number, since it is larger than the sum of its proper divisors (228671584).

261338936 is a wasteful number, since it uses less digits than its factorization.

261338936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32667373 (or 32667369 counting only the distinct ones).

The product of its digits is 139968, while the sum is 41.

The square root of 261338936 is about 16165.9808239401. The cubic root of 261338936 is about 639.3441654082.

The spelling of 261338936 in words is "two hundred sixty-one million, three hundred thirty-eight thousand, nine hundred thirty-six".