261899896 has 16 divisors (see below), whose sum is σ = 512413200. Its totient is φ = 125256384.

The previous prime is 261899893. The next prime is 261899929. The reversal of 261899896 is 698998162.

It is a self number, because there is not a number n which added to its sum of digits gives 261899896.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261899893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711501 + ... + 711868.

It is an arithmetic number, because the mean of its divisors is an integer number (32025825).

Almost surely, 2^261899896 is an apocalyptic number.

It is an amenable number.

261899896 is a deficient number, since it is larger than the sum of its proper divisors (250513304).

261899896 is a wasteful number, since it uses less digits than its factorization.

261899896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423398 (or 1423394 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 58.

The square root of 261899896 is about 16183.3215379291. The cubic root of 261899896 is about 639.8012859638.

The spelling of 261899896 in words is "two hundred sixty-one million, eight hundred ninety-nine thousand, eight hundred ninety-six".