261272398 has 4 divisors (see below), whose sum is σ = 391908600. Its totient is φ = 130636198.

The previous prime is 261272383. The next prime is 261272411. The reversal of 261272398 is 893272162.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 261272398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65318098 + ... + 65318101.

It is an arithmetic number, because the mean of its divisors is an integer number (97977150).

Almost surely, 2^261272398 is an apocalyptic number.

261272398 is a deficient number, since it is larger than the sum of its proper divisors (130636202).

261272398 is a wasteful number, since it uses less digits than its factorization.

261272398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130636201.

The product of its digits is 72576, while the sum is 40.

The square root of 261272398 is about 16163.9227293377. The cubic root of 261272398 is about 639.2899008918.

The spelling of 261272398 in words is "two hundred sixty-one million, two hundred seventy-two thousand, three hundred ninety-eight".