261396252 has 36 divisors (see below), whose sum is σ = 711579960. Its totient is φ = 80429472.

The previous prime is 261396229. The next prime is 261396259. The reversal of 261396252 is 252693162.

261396252 is a `hidden beast` number, since 26 + 1 + 3 + 9 + 625 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261396259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 278802 + ... + 279737.

It is an arithmetic number, because the mean of its divisors is an integer number (19766110).

Almost surely, 2^261396252 is an apocalyptic number.

It is an amenable number.

261396252 is an abundant number, since it is smaller than the sum of its proper divisors (450183708).

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

261396252 is a wasteful number, since it uses less digits than its factorization.

261396252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558562 (or 558557 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 261396252 is about 16167.7534617522. The cubic root of 261396252 is about 639.3909016149.

The spelling of 261396252 in words is "two hundred sixty-one million, three hundred ninety-six thousand, two hundred fifty-two".