997656222 has 16 divisors (see below), whose sum is σ = 1997154432. Its totient is φ = 332245080.

The previous prime is 997656131. The next prime is 997656223. The reversal of 997656222 is 222656799.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997656223) 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, 69658 + ... + 82749.

It is an arithmetic number, because the mean of its divisors is an integer number (124822152).

Almost surely, 2^997656222 is an apocalyptic number.

997656222 is an abundant number, since it is smaller than the sum of its proper divisors (999498210).

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

997656222 is a wasteful number, since it uses less digits than its factorization.

997656222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153503.

The product of its digits is 816480, while the sum is 48.

The square root of 997656222 is about 31585.6964779946. The cubic root of 997656222 is about 999.2181295045.

The spelling of 997656222 in words is "nine hundred ninety-seven million, six hundred fifty-six thousand, two hundred twenty-two".