998659940 has 24 divisors (see below), whose sum is σ = 2097936960. Its totient is φ = 399320928.

The previous prime is 998659889. The next prime is 998659967. The reversal of 998659940 is 49956899.

It is a self number, because there is not a number n which added to its sum of digits gives 998659940.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62051 + ... + 76469.

It is an arithmetic number, because the mean of its divisors is an integer number (87414040).

Almost surely, 2^998659940 is an apocalyptic number.

It is an amenable number.

998659940 is an abundant number, since it is smaller than the sum of its proper divisors (1099277020).

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

998659940 is a wasteful number, since it uses less digits than its factorization.

998659940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17891 (or 17889 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 59.

The square root of 998659940 is about 31601.5812895494. The cubic root of 998659940 is about 999.5531136557.

The spelling of 998659940 in words is "nine hundred ninety-eight million, six hundred fifty-nine thousand, nine hundred forty".