1398581 has 2 divisors, whose sum is σ = 1398582. Its totient is φ = 1398580.

The previous prime is 1398577. The next prime is 1398599. The reversal of 1398581 is 1858931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1380625 + 17956 = 1175^2 + 134^2 .

It is an emirp because it is prime and its reverse (1858931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1398581 - 2² = 1398577 is a prime.

It is a super-2 number, since 2×1398581² = 3912057627122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1398521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699290 + 699291.

It is an arithmetic number, because the mean of its divisors is an integer number (699291).

2^1398581 is an apocalyptic number.

It is an amenable number.

1398581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398581 is an equidigital number, since it uses as much as digits as its factorization.

1398581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The square root of 1398581 is about 1182.6161676554. The cubic root of 1398581 is about 111.8310857264.

The spelling of 1398581 in words is "one million, three hundred ninety-eight thousand, five hundred eighty-one".