261398 has 4 divisors (see below), whose sum is σ = 392100. Its totient is φ = 130698.

The previous prime is 261389. The next prime is 261407. The reversal of 261398 is 893162.

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

It is an interprime number because it is at equal distance from previous prime (261389) and next prime (261407).

It is a self number, because there is not a number n which added to its sum of digits gives 261398.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261398.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65348 + ... + 65351.

It is an arithmetic number, because the mean of its divisors is an integer number (98025).

2²⁶¹³⁹⁸ is an apocalyptic number.

261398 is a deficient number, since it is larger than the sum of its proper divisors (130702).

261398 is a wasteful number, since it uses less digits than its factorization.

261398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130701.

The product of its digits is 2592, while the sum is 29.

The square root of 261398 is about 511.2709653403. The cubic root of 261398 is about 63.9392326849.

The spelling of 261398 in words is "two hundred sixty-one thousand, three hundred ninety-eight".