997638006 has 16 divisors (see below), whose sum is σ = 1999378944. Its totient is φ = 331862184.

The previous prime is 997637989. The next prime is 997638007. The reversal of 997638006 is 600836799.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997638007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167790 + ... + 173633.

It is an arithmetic number, because the mean of its divisors is an integer number (124961184).

Almost surely, 2^997638006 is an apocalyptic number.

997638006 is an abundant number, since it is smaller than the sum of its proper divisors (1001740938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997638006 is a wasteful number, since it uses less digits than its factorization.

997638006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341915.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 997638006 is about 31585.4081183068. The cubic root of 997638006 is about 999.2120479613.

The spelling of 997638006 in words is "nine hundred ninety-seven million, six hundred thirty-eight thousand, six".