1999847445 has 32 divisors (see below), whose sum is σ = 3418008192. Its totient is φ = 994947072.

The previous prime is 1999847393. The next prime is 1999847449. The reversal of 1999847445 is 5447489991.

It is not a de Polignac number, because 1999847445 - 2¹⁴ = 1999831061 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999847449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5887 + ... + 63516.

It is an arithmetic number, because the mean of its divisors is an integer number (106812756).

Almost surely, 2^1999847445 is an apocalyptic number.

1999847445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1999847445 is a deficient number, since it is larger than the sum of its proper divisors (1418160747).

1999847445 is a wasteful number, since it uses less digits than its factorization.

1999847445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69541.

The product of its digits is 13063680, while the sum is 60.

The square root of 1999847445 is about 44719.6539007180. The cubic root of 1999847445 is about 1259.8890145377.

The spelling of 1999847445 in words is "one billion, nine hundred ninety-nine million, eight hundred forty-seven thousand, four hundred forty-five".