1397898 has 20 divisors (see below), whose sum is σ = 3132690. Its totient is φ = 465912.

The previous prime is 1397881. The next prime is 1397909. The reversal of 1397898 is 8987931.

It can be written as a sum of positive squares in only one way, i.e., 1034289 + 363609 = 1017^2 + 603^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4153 + ... + 4476.

2^1397898 is an apocalyptic number.

1397898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1397898 is an abundant number, since it is smaller than the sum of its proper divisors (1734792).

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

1397898 is an equidigital number, since it uses as much as digits as its factorization.

1397898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8643 (or 8634 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1397898 is about 1182.3273658340. The cubic root of 1397898 is about 111.8128784462.

The spelling of 1397898 in words is "one million, three hundred ninety-seven thousand, eight hundred ninety-eight".