1399405 has 8 divisors (see below), whose sum is σ = 1919232. Its totient is φ = 959568.

The previous prime is 1399403. The next prime is 1399417. The reversal of 1399405 is 5049931.

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 1399405 - 2¹ = 1399403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399403) 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, 19957 + ... + 20026.

It is an arithmetic number, because the mean of its divisors is an integer number (239904).

2^1399405 is an apocalyptic number.

It is an amenable number.

1399405 is a deficient number, since it is larger than the sum of its proper divisors (519827).

1399405 is an equidigital number, since it uses as much as digits as its factorization.

1399405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39995.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 1399405 is about 1182.9644965087. The cubic root of 1399405 is about 111.8530438691.

The spelling of 1399405 in words is "one million, three hundred ninety-nine thousand, four hundred five".