261942236 has 12 divisors (see below), whose sum is σ = 458643528. Its totient is φ = 130901232.

The previous prime is 261942223. The next prime is 261942259. The reversal of 261942236 is 632249162.

It is a super-2 number, since 2×261942236² = 137227470001359392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261942196 and 261942205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8531 + ... + 24426.

It is an arithmetic number, because the mean of its divisors is an integer number (38220294).

Almost surely, 2^261942236 is an apocalyptic number.

It is an amenable number.

261942236 is a deficient number, since it is larger than the sum of its proper divisors (196701292).

261942236 is a wasteful number, since it uses less digits than its factorization.

261942236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34948 (or 34946 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 261942236 is about 16184.6296219592. The cubic root of 261942236 is about 639.8357618929.

The spelling of 261942236 in words is "two hundred sixty-one million, nine hundred forty-two thousand, two hundred thirty-six".