997406 has 8 divisors (see below), whose sum is σ = 1506600. Its totient is φ = 495208.

The previous prime is 997391. The next prime is 997427. The reversal of 997406 is 604799.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1376 + ... + 1971.

It is an arithmetic number, because the mean of its divisors is an integer number (188325).

2⁹⁹⁷⁴⁰⁶ is an apocalyptic number.

997406 is a deficient number, since it is larger than the sum of its proper divisors (509194).

997406 is a wasteful number, since it uses less digits than its factorization.

997406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3498.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 997406 is about 998.7021578028. The cubic root of 997406 is about 99.9134584606.

The spelling of 997406 in words is "nine hundred ninety-seven thousand, four hundred six".