1394405 has 4 divisors (see below), whose sum is σ = 1673292. Its totient is φ = 1115520.

The previous prime is 1394401. The next prime is 1394413. The reversal of 1394405 is 5044931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5044931 = 307 ⋅16433.

It can be written as a sum of positive squares in 2 ways, for example, as 649636 + 744769 = 806^2 + 863^2 .

It is not a de Polignac number, because 1394405 - 2² = 1394401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1394401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139436 + ... + 139445.

It is an arithmetic number, because the mean of its divisors is an integer number (418323).

2^1394405 is an apocalyptic number.

It is an amenable number.

1394405 is a deficient number, since it is larger than the sum of its proper divisors (278887).

1394405 is an equidigital number, since it uses as much as digits as its factorization.

1394405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278886.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1394405 is about 1180.8492706523. The cubic root of 1394405 is about 111.7196698948.

The spelling of 1394405 in words is "one million, three hundred ninety-four thousand, four hundred five".