998923840 has 56 divisors (see below), whose sum is σ = 2385349560. Its totient is φ = 398450688.

The previous prime is 998923831. The next prime is 998923847. The reversal of 998923840 is 48329899.

It can be written as a sum of positive squares in 4 ways, for example, as 196448256 + 802475584 = 14016^2 + 28328^2 .

It is not an unprimeable number, because it can be changed into a prime (998923847) 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, 115176 + ... + 123544.

Almost surely, 2^998923840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998923840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1192674780).

998923840 is an abundant number, since it is smaller than the sum of its proper divisors (1386425720).

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

998923840 is a wasteful number, since it uses less digits than its factorization.

998923840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759 (or 8749 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 998923840 is about 31605.7564377124. The cubic root of 998923840 is about 999.6411512430.

The spelling of 998923840 in words is "nine hundred ninety-eight million, nine hundred twenty-three thousand, eight hundred forty".