997905 has 16 divisors (see below), whose sum is σ = 1620864.
Its totient is φ = 524160.
The previous prime is 997897. The next prime is 997933. The reversal of 997905 is 509799.
997905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 997905 - 23 = 997897 is a prime.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 597 + ... + 1533.
It is an arithmetic number, because the mean of its divisors is an integer number (101304).
2997905 is an apocalyptic number.
It is an amenable number.
997905 is a deficient number, since it is larger than the sum of its proper divisors (622959).
997905 is a wasteful number, since it uses less digits than its factorization.
997905 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1016.
The product of its (nonzero) digits is 25515, while the sum is 39.
The square root of 997905 is about 998.9519507964.
The cubic root of 997905 is about 99.9301178429.
The spelling of 997905 in words is "nine hundred ninety-seven thousand, nine hundred five".