1986968997 has 36 divisors (see below), whose sum is σ = 3118968580. Its totient is φ = 1218892896.

The previous prime is 1986968927. The next prime is 1986969001. The reversal of 1986968997 is 7998696891.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 6 ways, for example, as 1982831841 + 4137156 = 44529^2 + 2034^2 .

It is not a de Polignac number, because 1986968997 - 2⁸ = 1986968741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986968927) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6267883 + ... + 6268199.

Almost surely, 2^1986968997 is an apocalyptic number.

It is an amenable number.

1986968997 is a deficient number, since it is larger than the sum of its proper divisors (1131999583).

1986968997 is an frugal number, since it uses more digits than its factorization.

1986968997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 333 counting only the distinct ones).

The product of its digits is 105815808, while the sum is 72.

The square root of 1986968997 is about 44575.4304185613. The cubic root of 1986968997 is about 1257.1787462520.

The spelling of 1986968997 in words is "one billion, nine hundred eighty-six million, nine hundred sixty-eight thousand, nine hundred ninety-seven".