1391797 has 8 divisors (see below), whose sum is σ = 1571040. Its totient is φ = 1221360.

The previous prime is 1391779. The next prime is 1391849. The reversal of 1391797 is 7971931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1391797 - 2⁷ = 1391669 is a prime.

It is a Duffinian number.

1391797 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1863 + ... + 2500.

It is an arithmetic number, because the mean of its divisors is an integer number (196380).

2^1391797 is an apocalyptic number.

It is an amenable number.

1391797 is a deficient number, since it is larger than the sum of its proper divisors (179243).

1391797 is a wasteful number, since it uses less digits than its factorization.

1391797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4403.

The product of its digits is 11907, while the sum is 37.

The square root of 1391797 is about 1179.7444638565. The cubic root of 1391797 is about 111.6499754761.

It can be divided in two parts, 139 and 1797, that added together give a square (1936 = 44²).

The spelling of 1391797 in words is "one million, three hundred ninety-one thousand, seven hundred ninety-seven".