261869746 has 8 divisors (see below), whose sum is σ = 395672220. Its totient is φ = 129979008.

The previous prime is 261869737. The next prime is 261869791. The reversal of 261869746 is 647968162.

It can be written as a sum of positive squares in 2 ways, for example, as 261630625 + 239121 = 16175^2 + 489^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 261869746.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477591 + ... + 478138.

Almost surely, 2^261869746 is an apocalyptic number.

261869746 is a deficient number, since it is larger than the sum of its proper divisors (133802474).

261869746 is a wasteful number, since it uses less digits than its factorization.

261869746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955868.

The product of its digits is 870912, while the sum is 49.

The square root of 261869746 is about 16182.3899965364. The cubic root of 261869746 is about 639.7767336452.

The spelling of 261869746 in words is "two hundred sixty-one million, eight hundred sixty-nine thousand, seven hundred forty-six".