1391919 has 4 divisors (see below), whose sum is σ = 1855896. Its totient is φ = 927944.

The previous prime is 1391917. The next prime is 1391927. The reversal of 1391919 is 9191931.

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

It is a cyclic number.

It is not a de Polignac number, because 1391919 - 2¹ = 1391917 is a prime.

It is a super-2 number, since 2×1391919² = 3874877005122, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1391919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231984 + ... + 231989.

It is an arithmetic number, because the mean of its divisors is an integer number (463974).

2^1391919 is an apocalyptic number.

1391919 is a deficient number, since it is larger than the sum of its proper divisors (463977).

1391919 is an equidigital number, since it uses as much as digits as its factorization.

1391919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463976.

The product of its digits is 2187, while the sum is 33.

The square root of 1391919 is about 1179.7961688360. The cubic root of 1391919 is about 111.6532376614.

The spelling of 1391919 in words is "one million, three hundred ninety-one thousand, nine hundred nineteen".