261440972 has 18 divisors (see below), whose sum is σ = 495424188. Its totient is φ = 120664752.

The previous prime is 261440951. The next prime is 261440999. The reversal of 261440972 is 279044162.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192698 + ... + 194049.

It is an arithmetic number, because the mean of its divisors is an integer number (27523566).

Almost surely, 2^261440972 is an apocalyptic number.

It is an amenable number.

261440972 is a deficient number, since it is larger than the sum of its proper divisors (233983216).

261440972 is a wasteful number, since it uses less digits than its factorization.

261440972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386777 (or 386762 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 261440972 is about 16169.1364024180. The cubic root of 261440972 is about 639.4273621360.

The spelling of 261440972 in words is "two hundred sixty-one million, four hundred forty thousand, nine hundred seventy-two".