261992838 has 8 divisors (see below), whose sum is σ = 523985688. Its totient is φ = 87330944.

The previous prime is 261992837. The next prime is 261992891. The reversal of 261992838 is 838299162.

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

261992838 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261992837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21832731 + ... + 21832742.

It is an arithmetic number, because the mean of its divisors is an integer number (65498211).

Almost surely, 2^261992838 is an apocalyptic number.

261992838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261992838 is a wasteful number, since it uses less digits than its factorization.

261992838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43665478.

The product of its digits is 373248, while the sum is 48.

The square root of 261992838 is about 16186.1928198079. The cubic root of 261992838 is about 639.8769603967.

The spelling of 261992838 in words is "two hundred sixty-one million, nine hundred ninety-two thousand, eight hundred thirty-eight".