999405187283417 has 4 divisors (see below), whose sum is σ = 999405251813940. Its totient is φ = 999405122752896.

The previous prime is 999405187283389. The next prime is 999405187283483. The reversal of 999405187283417 is 714382781504999.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 591031576721881 + 408373610561536 = 24311141^2 + 20208256^2 .

It is a cyclic number.

It is not a de Polignac number, because 999405187283417 - 2¹⁶ = 999405187217881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999405187282417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6453053 + ... + 45171365.

It is an arithmetic number, because the mean of its divisors is an integer number (249851312953485).

It is a Poulet number, since it divides 2^{999405187283416}-1.

Almost surely, 2^{999405187283417} is an apocalyptic number.

999405187283417 is the 25812209-th pentagonal number.

It is an amenable number.

999405187283417 is a deficient number, since it is larger than the sum of its proper divisors (64530523).

999405187283417 is a wasteful number, since it uses less digits than its factorization.

999405187283417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64530522.

The product of its (nonzero) digits is 1097349120, while the sum is 77.

The spelling of 999405187283417 in words is "nine hundred ninety-nine trillion, four hundred five billion, one hundred eighty-seven million, two hundred eighty-three thousand, four hundred seventeen".