997218782 has 16 divisors (see below), whose sum is σ = 1727144160. Its totient is φ = 422972928.

The previous prime is 997218779. The next prime is 997218811. The reversal of 997218782 is 287812799.

It is a happy number.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365807 + ... + 368522.

It is an arithmetic number, because the mean of its divisors is an integer number (107946510).

Almost surely, 2^997218782 is an apocalyptic number.

997218782 is a deficient number, since it is larger than the sum of its proper divisors (729925378).

997218782 is a wasteful number, since it uses less digits than its factorization.

997218782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734435.

The product of its digits is 1016064, while the sum is 53.

The square root of 997218782 is about 31578.7710653850. The cubic root of 997218782 is about 999.0720665392.

The spelling of 997218782 in words is "nine hundred ninety-seven million, two hundred eighteen thousand, seven hundred eighty-two".