999390005 has 8 divisors (see below), whose sum is σ = 1199484600. Its totient is φ = 799367616.

The previous prime is 999389983. The next prime is 999390011. The reversal of 999390005 is 500093999.

It can be written as a sum of positive squares in 4 ways, for example, as 157577809 + 841812196 = 12553^2 + 29014^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999390005 - 2²⁴ = 982612789 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19511 + ... + 48779.

It is an arithmetic number, because the mean of its divisors is an integer number (149935575).

Almost surely, 2^999390005 is an apocalyptic number.

It is an amenable number.

999390005 is a deficient number, since it is larger than the sum of its proper divisors (200094595).

999390005 is a wasteful number, since it uses less digits than its factorization.

999390005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36103.

The product of its (nonzero) digits is 98415, while the sum is 44.

The square root of 999390005 is about 31613.1302625982. The cubic root of 999390005 is about 999.7966269756.

The spelling of 999390005 in words is "nine hundred ninety-nine million, three hundred ninety thousand, five".