1398266 has 4 divisors (see below), whose sum is σ = 2097402. Its totient is φ = 699132.

The previous prime is 1398263. The next prime is 1398269. The reversal of 1398266 is 6628931.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1398263) and next prime (1398269).

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 177241 = 1105^2 + 421^2 .

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (1398263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349565 + ... + 349568.

2^1398266 is an apocalyptic number.

1398266 is a deficient number, since it is larger than the sum of its proper divisors (699136).

1398266 is an equidigital number, since it uses as much as digits as its factorization.

1398266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699135.

The product of its digits is 15552, while the sum is 35.

The square root of 1398266 is about 1182.4829808500. The cubic root of 1398266 is about 111.8226892548.

The spelling of 1398266 in words is "one million, three hundred ninety-eight thousand, two hundred sixty-six".