1398558 has 48 divisors (see below), whose sum is σ = 3348864. Its totient is φ = 388080.

The previous prime is 1398557. The next prime is 1398559. The reversal of 1398558 is 8558931.

It is an interprime number because it is at equal distance from previous prime (1398557) and next prime (1398559).

Its product of digits (43200) is a multiple of the sum of its prime divisors (150).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398557) 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, 19663 + ... + 19733.

It is an arithmetic number, because the mean of its divisors is an integer number (69768).

2^1398558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1674432).

1398558 is an abundant number, since it is smaller than the sum of its proper divisors (1950306).

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

1398558 is a wasteful number, since it uses less digits than its factorization.

1398558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 150 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 1398558 is about 1182.6064434122. The cubic root of 1398558 is about 111.8304726934.

The spelling of 1398558 in words is "one million, three hundred ninety-eight thousand, five hundred fifty-eight".