1117998 has 48 divisors (see below), whose sum is σ = 2920320. Its totient is φ = 301968.

The previous prime is 1117993. The next prime is 1118003. The reversal of 1117998 is 8997111.

It is an interprime number because it is at equal distance from previous prime (1117993) and next prime (1118003).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1117993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2161 + ... + 2627.

It is an arithmetic number, because the mean of its divisors is an integer number (60840).

2^1117998 is an apocalyptic number.

1117998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1117998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1460160).

1117998 is an abundant number, since it is smaller than the sum of its proper divisors (1802322).

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

1117998 is a wasteful number, since it uses less digits than its factorization.

1117998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 498 counting only the distinct ones).

The product of its digits is 4536, while the sum is 36.

The square root of 1117998 is about 1057.3542452745. The cubic root of 1117998 is about 103.7879679105.

It can be divided in two parts, 111 and 7998, that multiplied together give a triangular number (887778 = T₁₃₃₂).

The spelling of 1117998 in words is "one million, one hundred seventeen thousand, nine hundred ninety-eight".