261947196 has 168 divisors, whose sum is σ = 807211104. Its totient is φ = 72783360.

The previous prime is 261947171. The next prime is 261947267. The reversal of 261947196 is 691749162.

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 836736 + ... + 837048.

It is an arithmetic number, because the mean of its divisors is an integer number (4804828).

Almost surely, 2^261947196 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 261947196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403605552).

261947196 is an abundant number, since it is smaller than the sum of its proper divisors (545263908).

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

261947196 is a wasteful number, since it uses less digits than its factorization.

261947196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 366 counting only the distinct ones).

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

The square root of 261947196 is about 16184.7828530382. The cubic root of 261947196 is about 639.8398003983.

The spelling of 261947196 in words is "two hundred sixty-one million, nine hundred forty-seven thousand, one hundred ninety-six".