1868692989 has 16 divisors (see below), whose sum is σ = 2723258880. Its totient is φ = 1134689280.

The previous prime is 1868692979. The next prime is 1868693009. The reversal of 1868692989 is 9892968681.

It is not a de Polignac number, because 1868692989 - 2¹⁷ = 1868561917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868692919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 589404 + ... + 592565.

It is an arithmetic number, because the mean of its divisors is an integer number (170203680).

Almost surely, 2^1868692989 is an apocalyptic number.

It is an amenable number.

1868692989 is a deficient number, since it is larger than the sum of its proper divisors (854565891).

1868692989 is a wasteful number, since it uses less digits than its factorization.

1868692989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182020.

The product of its digits is 26873856, while the sum is 66.

The square root of 1868692989 is about 43228.3817531954. The cubic root of 1868692989 is about 1231.7218683038.

It can be divided in two parts, 1868692 and 989, that added together give a palindrome (1869681).

The spelling of 1868692989 in words is "one billion, eight hundred sixty-eight million, six hundred ninety-two thousand, nine hundred eighty-nine".