997670798 has 4 divisors (see below), whose sum is σ = 1496506200. Its totient is φ = 498835398.

The previous prime is 997670777. The next prime is 997670801. The reversal of 997670798 is 897076799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 897076799 = 971 ⋅923869.

It is a self number, because there is not a number n which added to its sum of digits gives 997670798.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249417698 + ... + 249417701.

It is an arithmetic number, because the mean of its divisors is an integer number (374126550).

Almost surely, 2^997670798 is an apocalyptic number.

997670798 is a deficient number, since it is larger than the sum of its proper divisors (498835402).

997670798 is a wasteful number, since it uses less digits than its factorization.

997670798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498835401.

The product of its (nonzero) digits is 12002256, while the sum is 62.

The square root of 997670798 is about 31585.9272145049. The cubic root of 997670798 is about 999.2229957541. Note that the first 3 decimals are identical.

The spelling of 997670798 in words is "nine hundred ninety-seven million, six hundred seventy thousand, seven hundred ninety-eight".