261983438 has 8 divisors (see below), whose sum is σ = 413658120. Its totient is φ = 124097400.

The previous prime is 261983417. The next prime is 261983443. The reversal of 261983438 is 834389162.

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 3447113 + ... + 3447188.

It is an arithmetic number, because the mean of its divisors is an integer number (51707265).

Almost surely, 2^261983438 is an apocalyptic number.

261983438 is a deficient number, since it is larger than the sum of its proper divisors (151674682).

261983438 is a wasteful number, since it uses less digits than its factorization.

261983438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6894322.

The product of its digits is 248832, while the sum is 44.

The square root of 261983438 is about 16185.9024462648. The cubic root of 261983438 is about 639.8693076234.

The spelling of 261983438 in words is "two hundred sixty-one million, nine hundred eighty-three thousand, four hundred thirty-eight".