1400005 has 4 divisors (see below), whose sum is σ = 1680012. Its totient is φ = 1120000.

The previous prime is 1399999. The next prime is 1400017. The reversal of 1400005 is 5000041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5000041 = 317 ⋅15773.

It can be written as a sum of positive squares in 2 ways, for example, as 381924 + 1018081 = 618^2 + 1009^2 .

It is not a de Polignac number, because 1400005 - 2⁹ = 1399493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1399964 and 1400000.

It is a congruent number.

It is an unprimeable number.

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, 139996 + ... + 140005.

It is an arithmetic number, because the mean of its divisors is an integer number (420003).

2^1400005 is an apocalyptic number.

It is an amenable number.

1400005 is a deficient number, since it is larger than the sum of its proper divisors (280007).

1400005 is an equidigital number, since it uses as much as digits as its factorization.

1400005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280006.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 1400005 is about 1183.2180695037. The cubic root of 1400005 is about 111.8690273852.

Adding to 1400005 its reverse (5000041), we get a palindrome (6400046).

The spelling of 1400005 in words is "one million, four hundred thousand, five".