1986788994 has 32 divisors (see below), whose sum is σ = 4018533120. Its totient is φ = 654810000.

The previous prime is 1986788987. The next prime is 1986789001. The reversal of 1986788994 is 4998876891.

It is an interprime number because it is at equal distance from previous prime (1986788987) and next prime (1986789001).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204589 + ... + 214079.

It is an arithmetic number, because the mean of its divisors is an integer number (125579160).

Almost surely, 2^1986788994 is an apocalyptic number.

1986788994 is an abundant number, since it is smaller than the sum of its proper divisors (2031744126).

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

1986788994 is a wasteful number, since it uses less digits than its factorization.

1986788994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9886.

The product of its digits is 62705664, while the sum is 69.

The square root of 1986788994 is about 44573.4112896915. The cubic root of 1986788994 is about 1257.1407817643.

The spelling of 1986788994 in words is "one billion, nine hundred eighty-six million, seven hundred eighty-eight thousand, nine hundred ninety-four".