1999101456 has 120 divisors (see below), whose sum is σ = 6163075776. Its totient is φ = 599857920.

The previous prime is 1999101449. The next prime is 1999101463. The reversal of 1999101456 is 6541019991.

1999101456 is a `hidden beast` number, since 1 + 9 + 99 + 101 + 456 = 666.

It is an interprime number because it is at equal distance from previous prime (1999101449) and next prime (1999101463).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157026 + ... + 169278.

Almost surely, 2^1999101456 is an apocalyptic number.

1999101456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999101456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3081537888).

1999101456 is an abundant number, since it is smaller than the sum of its proper divisors (4163974320).

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

1999101456 is a wasteful number, since it uses less digits than its factorization.

1999101456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12381 (or 12372 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 1999101456 is about 44711.3123940687. The cubic root of 1999101456 is about 1259.7323392146.

The spelling of 1999101456 in words is "one billion, nine hundred ninety-nine million, one hundred one thousand, four hundred fifty-six".