999620609 has 16 divisors (see below), whose sum is σ = 1148716800. Its totient is φ = 862171776.

The previous prime is 999620563. The next prime is 999620623. The reversal of 999620609 is 906026999.

It is a cyclic number.

It is not a de Polignac number, because 999620609 - 2⁸ = 999620353 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999620659) 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, 9689 + ... + 45750.

It is an arithmetic number, because the mean of its divisors is an integer number (71794800).

It is a Proth number, since it is equal to 15253 ⋅ 2¹⁶ + 1 and 15253 < 2¹⁶.

Almost surely, 2^999620609 is an apocalyptic number.

It is an amenable number.

999620609 is a deficient number, since it is larger than the sum of its proper divisors (149096191).

999620609 is a wasteful number, since it uses less digits than its factorization.

999620609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55544.

The product of its (nonzero) digits is 472392, while the sum is 50.

The square root of 999620609 is about 31616.7773341939. Note that the first 3 decimals coincide. The cubic root of 999620609 is about 999.8735203369.

The spelling of 999620609 in words is "nine hundred ninety-nine million, six hundred twenty thousand, six hundred nine".