999620 has 24 divisors (see below), whose sum is σ = 2119488. Its totient is φ = 396000.

The previous prime is 999613. The next prime is 999623. The reversal of 999620 is 26999.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2855 + ... + 3185.

It is an arithmetic number, because the mean of its divisors is an integer number (88312).

2⁹⁹⁹⁶²⁰ is an apocalyptic number.

It is an amenable number.

999620 is an abundant number, since it is smaller than the sum of its proper divisors (1119868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999620 is a wasteful number, since it uses less digits than its factorization.

999620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 999620 is about 999.8099819466. The cubic root of 999620 is about 99.9873317286.

The spelling of 999620 in words is "nine hundred ninety-nine thousand, six hundred twenty".