1997646790 has 8 divisors (see below), whose sum is σ = 3595764240. Its totient is φ = 799058712.

The previous prime is 1997646779. The next prime is 1997646811. The reversal of 1997646790 is 976467991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 99882330 + ... + 99882349.

It is an arithmetic number, because the mean of its divisors is an integer number (449470530).

Almost surely, 2^1997646790 is an apocalyptic number.

1997646790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1997646790 is a deficient number, since it is larger than the sum of its proper divisors (1598117450).

1997646790 is a wasteful number, since it uses less digits than its factorization.

1997646790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199764686.

The product of its (nonzero) digits is 5143824, while the sum is 58.

The square root of 1997646790 is about 44695.0421187854. The cubic root of 1997646790 is about 1259.4267128287.

It can be divided in two parts, 19976 and 46790, that added together give a palindrome (66766).

The spelling of 1997646790 in words is "one billion, nine hundred ninety-seven million, six hundred forty-six thousand, seven hundred ninety".