997890658 has 16 divisors (see below), whose sum is σ = 1524773376. Its totient is φ = 489696480.

The previous prime is 997890653. The next prime is 997890671. The reversal of 997890658 is 856098799.

It is a junction number, because it is equal to n+sod(n) for n = 997890596 and 997890605.

It is not an unprimeable number, because it can be changed into a prime (997890653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15910 + ... + 47422.

It is an arithmetic number, because the mean of its divisors is an integer number (95298336).

Almost surely, 2^997890658 is an apocalyptic number.

997890658 is a deficient number, since it is larger than the sum of its proper divisors (526882718).

997890658 is a wasteful number, since it uses less digits than its factorization.

997890658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31809.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The square root of 997890658 is about 31589.4073701929. The cubic root of 997890658 is about 999.2963910506.

The spelling of 997890658 in words is "nine hundred ninety-seven million, eight hundred ninety thousand, six hundred fifty-eight".