1992123456 has 28 divisors (see below), whose sum is σ = 5270827152. Its totient is φ = 664041088.

The previous prime is 1992123433. The next prime is 1992123493. The reversal of 1992123456 is 6543212991.

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, 5187630 + ... + 5188013.

Almost surely, 2^1992123456 is an apocalyptic number.

1992123456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1992123456 is an abundant number, since it is smaller than the sum of its proper divisors (3278703696).

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

1992123456 is a wasteful number, since it uses less digits than its factorization.

1992123456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10375658 (or 10375648 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 1992123456 is about 44633.2102363251. The cubic root of 1992123456 is about 1258.2649032721.

The spelling of 1992123456 in words is "one billion, nine hundred ninety-two million, one hundred twenty-three thousand, four hundred fifty-six".