1391947 has 4 divisors (see below), whose sum is σ = 1396656. Its totient is φ = 1387240.

The previous prime is 1391941. The next prime is 1391969. The reversal of 1391947 is 7491931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7491931 = 89 ⋅84179.

It is a cyclic number.

It is not a de Polignac number, because 1391947 - 2¹⁵ = 1359179 is a prime.

It is a pancake number, because a pancake can be divided into 1391947 parts by 1668 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1879 + ... + 2512.

It is an arithmetic number, because the mean of its divisors is an integer number (349164).

2^1391947 is an apocalyptic number.

1391947 is a deficient number, since it is larger than the sum of its proper divisors (4709).

1391947 is an equidigital number, since it uses as much as digits as its factorization.

1391947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4708.

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

The square root of 1391947 is about 1179.8080352329. The cubic root of 1391947 is about 111.6539863327.

The spelling of 1391947 in words is "one million, three hundred ninety-one thousand, nine hundred forty-seven".