1997860886 has 32 divisors (see below), whose sum is σ = 3451818240. Its totient is φ = 849521376.

The previous prime is 1997860877. The next prime is 1997860903. The reversal of 1997860886 is 6880687991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1971716 + ... + 1972728.

It is an arithmetic number, because the mean of its divisors is an integer number (107869320).

Almost surely, 2^1997860886 is an apocalyptic number.

1997860886 is a deficient number, since it is larger than the sum of its proper divisors (1453957354).

1997860886 is a wasteful number, since it uses less digits than its factorization.

1997860886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The square root of 1997860886 is about 44697.4371301085. The cubic root of 1997860886 is about 1259.4717038636.

The spelling of 1997860886 in words is "one billion, nine hundred ninety-seven million, eight hundred sixty thousand, eight hundred eighty-six".