1997869806 has 16 divisors (see below), whose sum is σ = 4439710800. Its totient is φ = 665956584.

The previous prime is 1997869793. The next prime is 1997869807. The reversal of 1997869806 is 6089687991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997869807) 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 7 ways as a sum of consecutive naturals, for example, 18498741 + ... + 18498848.

It is an arithmetic number, because the mean of its divisors is an integer number (277481925).

Almost surely, 2^1997869806 is an apocalyptic number.

1997869806 is an abundant number, since it is smaller than the sum of its proper divisors (2441840994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1997869806 is a wasteful number, since it uses less digits than its factorization.

1997869806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36997600 (or 36997594 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The square root of 1997869806 is about 44697.5369120044. The cubic root of 1997869806 is about 1259.4735782802.

The spelling of 1997869806 in words is "one billion, nine hundred ninety-seven million, eight hundred sixty-nine thousand, eight hundred six".