261802 has 8 divisors (see below), whose sum is σ = 395136. Its totient is φ = 130092.

The previous prime is 261799. The next prime is 261823. The reversal of 261802 is 208162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 26 and 1802 contains 261802 itself.

It is a nialpdrome in base 4.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 261802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153 + ... + 739.

It is an arithmetic number, because the mean of its divisors is an integer number (49392).

2²⁶¹⁸⁰² is an apocalyptic number.

261802 is a deficient number, since it is larger than the sum of its proper divisors (133334).

261802 is a wasteful number, since it uses less digits than its factorization.

261802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 261802 is about 511.6659066227. The cubic root of 261802 is about 63.9721558565.

Adding to 261802 its reverse (208162), we get a palindrome (469964).

The spelling of 261802 in words is "two hundred sixty-one thousand, eight hundred two".