1391497 has 4 divisors (see below), whose sum is σ = 1436416. Its totient is φ = 1346580.

The previous prime is 1391483. The next prime is 1391519. The reversal of 1391497 is 7941931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7941931 = 59 ⋅134609.

It is a cyclic number.

It is not a de Polignac number, because 1391497 - 2¹⁵ = 1358729 is a prime.

1391497 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1391407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22413 + ... + 22474.

It is an arithmetic number, because the mean of its divisors is an integer number (359104).

2^1391497 is an apocalyptic number.

It is an amenable number.

1391497 is a deficient number, since it is larger than the sum of its proper divisors (44919).

1391497 is an equidigital number, since it uses as much as digits as its factorization.

1391497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44918.

The product of its digits is 6804, while the sum is 34.

The square root of 1391497 is about 1179.6173108258. The cubic root of 1391497 is about 111.6419528982.

The spelling of 1391497 in words is "one million, three hundred ninety-one thousand, four hundred ninety-seven".