1405913 has 4 divisors (see below), whose sum is σ = 1408308. Its totient is φ = 1403520.

The previous prime is 1405879. The next prime is 1405919. The reversal of 1405913 is 3195041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3195041 = 587 ⋅5443.

It can be written as a sum of positive squares in 2 ways, for example, as 868624 + 537289 = 932^2 + 733^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405913 - 2¹² = 1401817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1405919) 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, 353 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (352077).

2^1405913 is an apocalyptic number.

It is an amenable number.

1405913 is a deficient number, since it is larger than the sum of its proper divisors (2395).

1405913 is a wasteful number, since it uses less digits than its factorization.

1405913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1405913 is about 1185.7120223731. The cubic root of 1405913 is about 112.0261684177.

The spelling of 1405913 in words is "one million, four hundred five thousand, nine hundred thirteen".