1391798 has 4 divisors (see below), whose sum is σ = 2087700. Its totient is φ = 695898.

The previous prime is 1391779. The next prime is 1391849. The reversal of 1391798 is 8971931.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347948 + ... + 347951.

It is an arithmetic number, because the mean of its divisors is an integer number (521925).

2^1391798 is an apocalyptic number.

1391798 is a deficient number, since it is larger than the sum of its proper divisors (695902).

1391798 is an equidigital number, since it uses as much as digits as its factorization.

1391798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695901.

The product of its digits is 13608, while the sum is 38.

The square root of 1391798 is about 1179.7448876770. The cubic root of 1391798 is about 111.6500022161.

The spelling of 1391798 in words is "one million, three hundred ninety-one thousand, seven hundred ninety-eight".