981235398 has 64 divisors (see below), whose sum is σ = 2318803200. Its totient is φ = 272895360.

The previous prime is 981235397. The next prime is 981235417. The reversal of 981235398 is 893532189.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981235397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150388 + ... + 156776.

It is an arithmetic number, because the mean of its divisors is an integer number (36231300).

Almost surely, 2^981235398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 981235398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159401600).

981235398 is an abundant number, since it is smaller than the sum of its proper divisors (1337567802).

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

981235398 is a wasteful number, since it uses less digits than its factorization.

981235398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6597.

The product of its digits is 466560, while the sum is 48.

The square root of 981235398 is about 31324.6771411933. The cubic root of 981235398 is about 993.7055962755.

The spelling of 981235398 in words is "nine hundred eighty-one million, two hundred thirty-five thousand, three hundred ninety-eight".