1398986 has 4 divisors (see below), whose sum is σ = 2098482. Its totient is φ = 699492.

The previous prime is 1398979. The next prime is 1398997. The reversal of 1398986 is 6898931.

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., 1394761 + 4225 = 1181^2 + 65^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349745 + ... + 349748.

2^1398986 is an apocalyptic number.

1398986 is a deficient number, since it is larger than the sum of its proper divisors (699496).

1398986 is an equidigital number, since it uses as much as digits as its factorization.

1398986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699495.

The product of its digits is 93312, while the sum is 44.

The square root of 1398986 is about 1182.7873857968. The cubic root of 1398986 is about 111.8418793376.

Subtracting 1398986 from its reverse (6898931), we obtain a palindrome (5499945).

The spelling of 1398986 in words is "one million, three hundred ninety-eight thousand, nine hundred eighty-six".