1986986938 has 8 divisors (see below), whose sum is σ = 3009990420. Its totient is φ = 983656800.

The previous prime is 1986986929. The next prime is 1986986983. The reversal of 1986986938 is 8396896891.

It can be written as a sum of positive squares in 2 ways, for example, as 1893729289 + 93257649 = 43517^2 + 9657^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4918083 + ... + 4918486.

Almost surely, 2^1986986938 is an apocalyptic number.

1986986938 is a deficient number, since it is larger than the sum of its proper divisors (1023003482).

1986986938 is a wasteful number, since it uses less digits than its factorization.

1986986938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9836672.

The product of its digits is 40310784, while the sum is 67.

The square root of 1986986938 is about 44575.6316612564. The cubic root of 1986986938 is about 1257.1825300681.

The spelling of 1986986938 in words is "one billion, nine hundred eighty-six million, nine hundred eighty-six thousand, nine hundred thirty-eight".