999621339 has 16 divisors (see below), whose sum is σ = 1353834144. Its totient is φ = 655948800.

The previous prime is 999621323. The next prime is 999621353. The reversal of 999621339 is 933126999.

It is a happy number.

It is not a de Polignac number, because 999621339 - 2⁴ = 999621323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999621291 and 999621300.

It is not an unprimeable number, because it can be changed into a prime (999621379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109719 + ... + 118479.

It is an arithmetic number, because the mean of its divisors is an integer number (84614634).

Almost surely, 2^999621339 is an apocalyptic number.

999621339 is a deficient number, since it is larger than the sum of its proper divisors (354212805).

999621339 is a wasteful number, since it uses less digits than its factorization.

999621339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9358.

The product of its digits is 708588, while the sum is 51.

The square root of 999621339 is about 31616.7888786954. The cubic root of 999621339 is about 999.8737637317.

The spelling of 999621339 in words is "nine hundred ninety-nine million, six hundred twenty-one thousand, three hundred thirty-nine".