261493936 has 20 divisors (see below), whose sum is σ = 552703464. Its totient is φ = 118860800.

The previous prime is 261493933. The next prime is 261493937. The reversal of 261493936 is 639394162.

It is a junction number, because it is equal to n+sod(n) for n = 261493892 and 261493901.

It is not an unprimeable number, because it can be changed into a prime (261493931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742705 + ... + 743056.

Almost surely, 2^261493936 is an apocalyptic number.

It is an amenable number.

261493936 is an abundant number, since it is smaller than the sum of its proper divisors (291209528).

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

261493936 is a wasteful number, since it uses less digits than its factorization.

261493936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485780 (or 1485774 counting only the distinct ones).

The product of its digits is 209952, while the sum is 43.

The square root of 261493936 is about 16170.7741311293. The cubic root of 261493936 is about 639.4705386688.

The spelling of 261493936 in words is "two hundred sixty-one million, four hundred ninety-three thousand, nine hundred thirty-six".