1781226872 has 16 divisors (see below), whose sum is σ = 3364180560. Its totient is φ = 884112064.

The previous prime is 1781226871. The next prime is 1781226899. The reversal of 1781226872 is 2786221871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781226871) by changing a digit.

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, 811508 + ... + 813699.

It is an arithmetic number, because the mean of its divisors is an integer number (210261285).

Almost surely, 2^1781226872 is an apocalyptic number.

It is an amenable number.

1781226872 is a deficient number, since it is larger than the sum of its proper divisors (1582953688).

1781226872 is a wasteful number, since it uses less digits than its factorization.

1781226872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625350 (or 1625346 counting only the distinct ones).

The product of its digits is 150528, while the sum is 44.

The square root of 1781226872 is about 42204.5835425490. The cubic root of 1781226872 is about 1212.1966499707.

The spelling of 1781226872 in words is "one billion, seven hundred eighty-one million, two hundred twenty-six thousand, eight hundred seventy-two".