997655 has 8 divisors (see below), whose sum is σ = 1217184. Its totient is φ = 784800.

The previous prime is 997651. The next prime is 997663. The reversal of 997655 is 556799.

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

It is not a de Polignac number, because 997655 - 2² = 997651 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997651) 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, 1331 + ... + 1940.

It is an arithmetic number, because the mean of its divisors is an integer number (152148).

2⁹⁹⁷⁶⁵⁵ is an apocalyptic number.

997655 is a deficient number, since it is larger than the sum of its proper divisors (219529).

997655 is a wasteful number, since it uses less digits than its factorization.

997655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337.

The product of its digits is 85050, while the sum is 41.

The square root of 997655 is about 998.8268118147. The cubic root of 997655 is about 99.9217721533.

The spelling of 997655 in words is "nine hundred ninety-seven thousand, six hundred fifty-five".