1398920 has 32 divisors (see below), whose sum is σ = 3228120. Its totient is φ = 545280.

The previous prime is 1398911. The next prime is 1398967. The reversal of 1398920 is 298931.

It can be written as a sum of positive squares in 4 ways, for example, as 386884 + 1012036 = 622^2 + 1006^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1214 + ... + 2066.

2^1398920 is an apocalyptic number.

1398920 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 1398920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1614060).

1398920 is an abundant number, since it is smaller than the sum of its proper divisors (1829200).

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

1398920 is a wasteful number, since it uses less digits than its factorization.

1398920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1398920 is about 1182.7594852716. The cubic root of 1398920 is about 111.8401205208.

The spelling of 1398920 in words is "one million, three hundred ninety-eight thousand, nine hundred twenty".