1398506 has 4 divisors (see below), whose sum is σ = 2097762. Its totient is φ = 699252.

The previous prime is 1398497. The next prime is 1398517. The reversal of 1398506 is 6058931.

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

It can be written as a sum of positive squares in only one way, i.e., 1343281 + 55225 = 1159^2 + 235^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349625 + ... + 349628.

2^1398506 is an apocalyptic number.

1398506 is a deficient number, since it is larger than the sum of its proper divisors (699256).

1398506 is an equidigital number, since it uses as much as digits as its factorization.

1398506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699255.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1398506 is about 1182.5844578718. The cubic root of 1398506 is about 111.8290866809.

The spelling of 1398506 in words is "one million, three hundred ninety-eight thousand, five hundred six".