999990625 has 24 divisors (see below), whose sum is σ = 1267793856.
Its totient is φ = 788550000.
The previous prime is 999990599. The next prime is 999990631. The reversal of 999990625 is 526099999.
It is not a de Polignac number, because 999990625 - 215 = 999957857 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 999990625.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219622 + ... + 224128.
It is an arithmetic number, because the mean of its divisors is an integer number (52824744).
Almost surely, 2999990625 is an apocalyptic number.
It is an amenable number.
999990625 is a deficient number, since it is larger than the sum of its proper divisors (267803231).
999990625 is an frugal number, since it uses more digits than its factorization.
999990625 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4603 (or 4583 counting only the distinct ones).
The product of its (nonzero) digits is 3542940, while the sum is 58.
The square root of 999990625 is about 31622.6283695711.
The cubic root of 999990625 is about 999.9968749902.
The spelling of 999990625 in words is "nine hundred ninety-nine million, nine hundred ninety thousand, six hundred twenty-five".