999926405 has 4 divisors (see below), whose sum is σ = 1199911692. Its totient is φ = 799941120.

The previous prime is 999926387. The next prime is 999926413. The reversal of 999926405 is 504629999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154803364 + 845123041 = 12442^2 + 29071^2 .

It is not a de Polignac number, because 999926405 - 2⁶ = 999926341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99992636 + ... + 99992645.

It is an arithmetic number, because the mean of its divisors is an integer number (299977923).

Almost surely, 2^999926405 is an apocalyptic number.

It is an amenable number.

999926405 is a deficient number, since it is larger than the sum of its proper divisors (199985287).

999926405 is a wasteful number, since it uses less digits than its factorization.

999926405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199985286.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 999926405 is about 31621.6129411515. The cubic root of 999926405 is about 999.9754677315.

The spelling of 999926405 in words is "nine hundred ninety-nine million, nine hundred twenty-six thousand, four hundred five".