1406905 has 4 divisors (see below), whose sum is σ = 1688292. Its totient is φ = 1125520.

The previous prime is 1406897. The next prime is 1406927. The reversal of 1406905 is 5096041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5096041 = 23 ⋅221567.

It can be written as a sum of positive squares in 2 ways, for example, as 316969 + 1089936 = 563^2 + 1044^2 .

It is not a de Polignac number, because 1406905 - 2³ = 1406897 is a prime.

It is a Duffinian number.

1406905 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1406905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140686 + ... + 140695.

It is an arithmetic number, because the mean of its divisors is an integer number (422073).

2^1406905 is an apocalyptic number.

It is an amenable number.

1406905 is a deficient number, since it is larger than the sum of its proper divisors (281387).

1406905 is an equidigital number, since it uses as much as digits as its factorization.

1406905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281386.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1406905 is about 1186.1302626609. The cubic root of 1406905 is about 112.0525104535.

The spelling of 1406905 in words is "one million, four hundred six thousand, nine hundred five".