997906 has 16 divisors (see below), whose sum is σ = 1842624. Its totient is φ = 394704.

The previous prime is 997897. The next prime is 997933. The reversal of 997906 is 609799.

997906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2560 + ... + 2923.

It is an arithmetic number, because the mean of its divisors is an integer number (115164).

2⁹⁹⁷⁹⁰⁶ is an apocalyptic number.

997906 is a deficient number, since it is larger than the sum of its proper divisors (844718).

997906 is a wasteful number, since it uses less digits than its factorization.

997906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5505.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 997906 is about 998.9524513209. The cubic root of 997906 is about 99.9301512228.

The spelling of 997906 in words is "nine hundred ninety-seven thousand, nine hundred six".