999340639 has 32 divisors (see below), whose sum is σ = 1159441920. Its totient is φ = 852508800.

The previous prime is 999340619. The next prime is 999340673. The reversal of 999340639 is 936043999.

It is not a de Polignac number, because 999340639 - 2⁹ = 999340127 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 (999340619) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5521129 + ... + 5521309.

It is an arithmetic number, because the mean of its divisors is an integer number (36232560).

Almost surely, 2^999340639 is an apocalyptic number.

999340639 is a deficient number, since it is larger than the sum of its proper divisors (160101281).

999340639 is a wasteful number, since it uses less digits than its factorization.

999340639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511.

The product of its (nonzero) digits is 1417176, while the sum is 52.

The square root of 999340639 is about 31612.3494697879. The cubic root of 999340639 is about 999.7801646760.

The spelling of 999340639 in words is "nine hundred ninety-nine million, three hundred forty thousand, six hundred thirty-nine".