1405655 has 4 divisors (see below), whose sum is σ = 1686792. Its totient is φ = 1124520.

The previous prime is 1405643. The next prime is 1405669. The reversal of 1405655 is 5565041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5565041 = 1607 ⋅3463.

It is not a de Polignac number, because 1405655 - 2¹² = 1401559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 140561 + ... + 140570.

It is an arithmetic number, because the mean of its divisors is an integer number (421698).

2^1405655 is an apocalyptic number.

1405655 is a deficient number, since it is larger than the sum of its proper divisors (281137).

1405655 is an equidigital number, since it uses as much as digits as its factorization.

1405655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281136.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1405655 is about 1185.6032219929. The cubic root of 1405655 is about 112.0193153337.

The spelling of 1405655 in words is "one million, four hundred five thousand, six hundred fifty-five".