1986669612 has 24 divisors (see below), whose sum is σ = 5150625200. Its totient is φ = 662223168.

The previous prime is 1986669511. The next prime is 1986669631. The reversal of 1986669612 is 2169666891.

It is a happy number.

It is a super-2 number, since 2×1986669612² = 7893712294488461088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9197437 + ... + 9197652.

Almost surely, 2^1986669612 is an apocalyptic number.

1986669612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1986669612 is an abundant number, since it is smaller than the sum of its proper divisors (3163955588).

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

1986669612 is a wasteful number, since it uses less digits than its factorization.

1986669612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18395102 (or 18395094 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 1986669612 is about 44572.0721079916. The cubic root of 1986669612 is about 1257.1156016056.

The spelling of 1986669612 in words is "one billion, nine hundred eighty-six million, six hundred sixty-nine thousand, six hundred twelve".