1391009 has 8 divisors (see below), whose sum is σ = 1476000. Its totient is φ = 1307232.

The previous prime is 1390993. The next prime is 1391011. The reversal of 1391009 is 9001931.

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 1391009 - 2⁴ = 1390993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1391029) 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, 3197 + ... + 3605.

It is an arithmetic number, because the mean of its divisors is an integer number (184500).

2^1391009 is an apocalyptic number.

1391009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1391009 is a deficient number, since it is larger than the sum of its proper divisors (84991).

1391009 is a wasteful number, since it uses less digits than its factorization.

1391009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 1391009 is about 1179.4104459432. The cubic root of 1391009 is about 111.6289003744.

The spelling of 1391009 in words is "one million, three hundred ninety-one thousand, nine".