1405279 has 4 divisors (see below), whose sum is σ = 1413576. Its totient is φ = 1396984.

The previous prime is 1405267. The next prime is 1405289. The reversal of 1405279 is 9725041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9725041 = 31 ⋅313711.

It is a cyclic number.

It is not a de Polignac number, because 1405279 - 2⁵ = 1405247 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 (1405249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3889 + ... + 4234.

It is an arithmetic number, because the mean of its divisors is an integer number (353394).

2^1405279 is an apocalyptic number.

1405279 is a deficient number, since it is larger than the sum of its proper divisors (8297).

1405279 is an equidigital number, since it uses as much as digits as its factorization.

1405279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8296.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1405279 is about 1185.4446423178. Note that the first 3 decimals coincide. The cubic root of 1405279 is about 112.0093263917.

The spelling of 1405279 in words is "one million, four hundred five thousand, two hundred seventy-nine".