261401208 has 16 divisors (see below), whose sum is σ = 653503080. Its totient is φ = 87133728.

The previous prime is 261401201. The next prime is 261401243. The reversal of 261401208 is 802104162.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 10891717 = 261401208 / (2 + 6 + 1 + 4 + 0 + 1 + 2 + 0 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261401201) 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, 5445835 + ... + 5445882.

Almost surely, 2^261401208 is an apocalyptic number.

It is an amenable number.

261401208 is an abundant number, since it is smaller than the sum of its proper divisors (392101872).

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

261401208 is a wasteful number, since it uses less digits than its factorization.

261401208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10891726 (or 10891722 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 261401208 is about 16167.9067290729. The cubic root of 261401208 is about 639.3949424804.

The spelling of 261401208 in words is "two hundred sixty-one million, four hundred one thousand, two hundred eight".