997890598 has 4 divisors (see below), whose sum is σ = 1496835900. Its totient is φ = 498945298.

The previous prime is 997890559. The next prime is 997890613. The reversal of 997890598 is 895098799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 895098799 = 7 ⋅127871257.

It is a super-3 number, since 3×997890598³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 249472648 + ... + 249472651.

It is an arithmetic number, because the mean of its divisors is an integer number (374208975).

Almost surely, 2^997890598 is an apocalyptic number.

997890598 is a deficient number, since it is larger than the sum of its proper divisors (498945302).

997890598 is a wasteful number, since it uses less digits than its factorization.

997890598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498945301.

The product of its (nonzero) digits is 14696640, while the sum is 64.

The square root of 997890598 is about 31589.4064205075. The cubic root of 997890598 is about 999.2963710224.

It can be divided in two parts, 9978 and 90598, that added together give a triangular number (100576 = T₄₄₈).

The spelling of 997890598 in words is "nine hundred ninety-seven million, eight hundred ninety thousand, five hundred ninety-eight".