1138998 has 32 divisors (see below), whose sum is σ = 2663424. Its totient is φ = 317952.

The previous prime is 1138997. The next prime is 1138999. The reversal of 1138998 is 8998311.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1138997) and next prime (1138999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1686 + ... + 2262.

It is an arithmetic number, because the mean of its divisors is an integer number (83232).

2^1138998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1331712).

1138998 is an abundant number, since it is smaller than the sum of its proper divisors (1524426).

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

1138998 is a wasteful number, since it uses less digits than its factorization.

1138998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636.

The product of its digits is 15552, while the sum is 39.

The square root of 1138998 is about 1067.2384925592. The cubic root of 1138998 is about 104.4337774764.

The spelling of 1138998 in words is "one million, one hundred thirty-eight thousand, nine hundred ninety-eight".