261869814 has 32 divisors (see below), whose sum is σ = 588954240. Its totient is φ = 86236776.

The previous prime is 261869791. The next prime is 261869827. The reversal of 261869814 is 418968162.

It is a self number, because there is not a number n which added to its sum of digits gives 261869814.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24732 + ... + 33695.

It is an arithmetic number, because the mean of its divisors is an integer number (18404820).

Almost surely, 2^261869814 is an apocalyptic number.

261869814 is an abundant number, since it is smaller than the sum of its proper divisors (327084426).

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

261869814 is a wasteful number, since it uses less digits than its factorization.

261869814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58521 (or 58515 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 261869814 is about 16182.3920975856. The cubic root of 261869814 is about 639.7767890224.

The spelling of 261869814 in words is "two hundred sixty-one million, eight hundred sixty-nine thousand, eight hundred fourteen".