997108138 has 16 divisors (see below), whose sum is σ = 1631105280. Its totient is φ = 454377456.

The previous prime is 997108109. The next prime is 997108171. The reversal of 997108138 is 831801799.

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, 240670 + ... + 244777.

It is an arithmetic number, because the mean of its divisors is an integer number (101944080).

Almost surely, 2^997108138 is an apocalyptic number.

997108138 is a deficient number, since it is larger than the sum of its proper divisors (633997142).

997108138 is a wasteful number, since it uses less digits than its factorization.

997108138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485541.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 997108138 is about 31577.0191436747. The cubic root of 997108138 is about 999.0351152969.

The spelling of 997108138 in words is "nine hundred ninety-seven million, one hundred eight thousand, one hundred thirty-eight".