1398257 has 4 divisors (see below), whose sum is σ = 1598016. Its totient is φ = 1198500.

The previous prime is 1398251. The next prime is 1398259. The reversal of 1398257 is 7528931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7528931 = 59 ⋅127609.

It is a cyclic number.

It is not a de Polignac number, because 1398257 - 2¹⁰ = 1397233 is a prime.

It is a d-powerful number, because it can be written as 1 + 3⁷ + 9⁶ + 8⁵ + 2¹³ + 5³ + 7⁷ .

It is not an unprimeable number, because it can be changed into a prime (1398251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99869 + ... + 99882.

It is an arithmetic number, because the mean of its divisors is an integer number (399504).

2^1398257 is an apocalyptic number.

It is an amenable number.

1398257 is a deficient number, since it is larger than the sum of its proper divisors (199759).

1398257 is an equidigital number, since it uses as much as digits as its factorization.

1398257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199758.

The product of its digits is 15120, while the sum is 35.

The square root of 1398257 is about 1182.4791752923. The cubic root of 1398257 is about 111.8224493371.

The spelling of 1398257 in words is "one million, three hundred ninety-eight thousand, two hundred fifty-seven".