997138 has 8 divisors (see below), whose sum is σ = 1514880. Its totient is φ = 492180.

The previous prime is 997123. The next prime is 997141. The reversal of 997138 is 831799.

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

It is a junction number, because it is equal to n+sod(n) for n = 997097 and 997106.

It is an unprimeable number.

997138 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 2998 + ... + 3313.

It is an arithmetic number, because the mean of its divisors is an integer number (189360).

2⁹⁹⁷¹³⁸ is an apocalyptic number.

997138 is a deficient number, since it is larger than the sum of its proper divisors (517742).

997138 is a wasteful number, since it uses less digits than its factorization.

997138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6392.

The product of its digits is 13608, while the sum is 37.

The square root of 997138 is about 998.5679746517. The cubic root of 997138 is about 99.9045088434.

The spelling of 997138 in words is "nine hundred ninety-seven thousand, one hundred thirty-eight".