261421772 has 12 divisors (see below), whose sum is σ = 477379056. Its totient is φ = 125027760.

The previous prime is 261421763. The next prime is 261421793. The reversal of 261421772 is 277124162.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1420679 + ... + 1420862.

It is an arithmetic number, because the mean of its divisors is an integer number (39781588).

Almost surely, 2^261421772 is an apocalyptic number.

It is an amenable number.

261421772 is a deficient number, since it is larger than the sum of its proper divisors (215957284).

261421772 is a wasteful number, since it uses less digits than its factorization.

261421772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2841568 (or 2841566 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 261421772 is about 16168.5426677855. The cubic root of 261421772 is about 639.4117087544.

The spelling of 261421772 in words is "two hundred sixty-one million, four hundred twenty-one thousand, seven hundred seventy-two".