997636254 has 16 divisors (see below), whose sum is σ = 2049199248. Its totient is φ = 323557632.

The previous prime is 997636223. The next prime is 997636261. The reversal of 997636254 is 452636799.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 997636197 and 997636206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2246707 + ... + 2247150.

It is an arithmetic number, because the mean of its divisors is an integer number (128074953).

Almost surely, 2^997636254 is an apocalyptic number.

997636254 is an abundant number, since it is smaller than the sum of its proper divisors (1051562994).

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

997636254 is a wasteful number, since it uses less digits than its factorization.

997636254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493899.

The product of its digits is 2449440, while the sum is 51.

The square root of 997636254 is about 31585.3803839688. The cubic root of 997636254 is about 999.2114630396.

The spelling of 997636254 in words is "nine hundred ninety-seven million, six hundred thirty-six thousand, two hundred fifty-four".