261974196 has 72 divisors (see below), whose sum is σ = 746587520. Its totient is φ = 79382160.

The previous prime is 261974179. The next prime is 261974227. The reversal of 261974196 is 691479162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3045 + ... + 23091.

Almost surely, 2^261974196 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261974196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (373293760).

261974196 is an abundant number, since it is smaller than the sum of its proper divisors (484613324).

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

261974196 is a wasteful number, since it uses less digits than its factorization.

261974196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20082 (or 20063 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 261974196 is about 16185.6169483897. The cubic root of 261974196 is about 639.8617833034.

The spelling of 261974196 in words is "two hundred sixty-one million, nine hundred seventy-four thousand, one hundred ninety-six".