998740 has 12 divisors (see below), whose sum is σ = 2097396. Its totient is φ = 399488.

The previous prime is 998737. The next prime is 998743. The reversal of 998740 is 47899.

998740 = 251² + 252² + ... + 265².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (998737) and next prime (998743).

It can be written as a sum of positive squares in 2 ways, for example, as 283024 + 715716 = 532^2 + 846^2 .

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 998740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24949 + ... + 24988.

It is an arithmetic number, because the mean of its divisors is an integer number (174783).

2⁹⁹⁸⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

998740 is an abundant number, since it is smaller than the sum of its proper divisors (1098656).

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

998740 is a wasteful number, since it uses less digits than its factorization.

998740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49946 (or 49944 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 998740 is about 999.3698014249. The cubic root of 998740 is about 99.9579823476.

The spelling of 998740 in words is "nine hundred ninety-eight thousand, seven hundred forty".