261960398 has 16 divisors (see below), whose sum is σ = 460029024. Its totient is φ = 109530240.

The previous prime is 261960383. The next prime is 261960401. The reversal of 261960398 is 893069162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227615 + ... + 228762.

It is an arithmetic number, because the mean of its divisors is an integer number (28751814).

Almost surely, 2^261960398 is an apocalyptic number.

261960398 is a deficient number, since it is larger than the sum of its proper divisors (198068626).

261960398 is a wasteful number, since it uses less digits than its factorization.

261960398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456427.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 261960398 is about 16185.1907001431. The cubic root of 261960398 is about 639.8505494134.

The spelling of 261960398 in words is "two hundred sixty-one million, nine hundred sixty thousand, three hundred ninety-eight".