999938413 has 4 divisors (see below), whose sum is σ = 1016330908. Its totient is φ = 983545920.

The previous prime is 999938399. The next prime is 999938461. The reversal of 999938413 is 314839999.

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 80514729 + 919423684 = 8973^2 + 30322^2 .

It is a cyclic number.

It is not a de Polignac number, because 999938413 - 2²¹ = 997841261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999738413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8196156 + ... + 8196277.

It is an arithmetic number, because the mean of its divisors is an integer number (254082727).

Almost surely, 2^999938413 is an apocalyptic number.

It is an amenable number.

999938413 is a deficient number, since it is larger than the sum of its proper divisors (16392495).

999938413 is a wasteful number, since it uses less digits than its factorization.

999938413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16392494.

The product of its digits is 1889568, while the sum is 55.

The square root of 999938413 is about 31621.8028107191. The cubic root of 999938413 is about 999.9794705785.

The spelling of 999938413 in words is "nine hundred ninety-nine million, nine hundred thirty-eight thousand, four hundred thirteen".