999987745 has 16 divisors (see below), whose sum is σ = 1255419648. Its totient is φ = 763864960.

The previous prime is 999987743. The next prime is 999987761. The reversal of 999987745 is 547789999.

999987745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999987745 - 2¹ = 999987743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999987743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42259 + ... + 61528.

It is an arithmetic number, because the mean of its divisors is an integer number (78463728).

Almost surely, 2^999987745 is an apocalyptic number.

It is an amenable number.

999987745 is a deficient number, since it is larger than the sum of its proper divisors (255431903).

999987745 is a wasteful number, since it uses less digits than its factorization.

999987745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103880.

The product of its digits is 51438240, while the sum is 67.

The square root of 999987745 is about 31622.5828325265. The cubic root of 999987745 is about 999.9959149833.

The spelling of 999987745 in words is "nine hundred ninety-nine million, nine hundred eighty-seven thousand, seven hundred forty-five".