1401605 has 4 divisors (see below), whose sum is σ = 1681932. Its totient is φ = 1121280.

The previous prime is 1401601. The next prime is 1401607. The reversal of 1401605 is 5061041.

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: 5061041 = 719 ⋅7039.

It can be written as a sum of positive squares in 2 ways, for example, as 452929 + 948676 = 673^2 + 974^2 .

It is not a de Polignac number, because 1401605 - 2² = 1401601 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 (1401601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140156 + ... + 140165.

It is an arithmetic number, because the mean of its divisors is an integer number (420483).

2^1401605 is an apocalyptic number.

It is an amenable number.

1401605 is a deficient number, since it is larger than the sum of its proper divisors (280327).

1401605 is an equidigital number, since it uses as much as digits as its factorization.

1401605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280326.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1401605 is about 1183.8939986333. The cubic root of 1401605 is about 111.9116277808.

Adding to 1401605 its reverse (5061041), we get a palindrome (6462646).

The spelling of 1401605 in words is "one million, four hundred one thousand, six hundred five".