1398720 has 112 divisors (see below), whose sum is σ = 4681728. Its totient is φ = 353280.

The previous prime is 1398707. The next prime is 1398721. The reversal of 1398720 is 278931.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398721) 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, 29737 + ... + 29783.

2^1398720 is an apocalyptic number.

1398720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2340864).

1398720 is an abundant number, since it is smaller than the sum of its proper divisors (3283008).

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

1398720 is a wasteful number, since it uses less digits than its factorization.

1398720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1398720 is about 1182.6749342064. The cubic root of 1398720 is about 111.8347904352.

The spelling of 1398720 in words is "one million, three hundred ninety-eight thousand, seven hundred twenty".