1391406 has 8 divisors (see below), whose sum is σ = 2782824. Its totient is φ = 463800.

The previous prime is 1391393. The next prime is 1391407. The reversal of 1391406 is 6041931.

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

1391406 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391407) 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, 115945 + ... + 115956.

It is an arithmetic number, because the mean of its divisors is an integer number (347853).

2^1391406 is an apocalyptic number.

1391406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391406 is a wasteful number, since it uses less digits than its factorization.

1391406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231906.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1391406 is about 1179.5787383638. The cubic root of 1391406 is about 111.6395191550.

It can be divided in two parts, 13 and 91406, that added together give a palindrome (91419).

The spelling of 1391406 in words is "one million, three hundred ninety-one thousand, four hundred six".