1253405 has 4 divisors (see below), whose sum is σ = 1504092. Its totient is φ = 1002720.

The previous prime is 1253401. The next prime is 1253437. The reversal of 1253405 is 5043521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 515524 + 737881 = 718^2 + 859^2 .

It is not a de Polignac number, because 1253405 - 2² = 1253401 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253401) 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, 125336 + ... + 125345.

It is an arithmetic number, because the mean of its divisors is an integer number (376023).

2^1253405 is an apocalyptic number.

It is an amenable number.

1253405 is a deficient number, since it is larger than the sum of its proper divisors (250687).

1253405 is an equidigital number, since it uses as much as digits as its factorization.

1253405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250686.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 1253405 is about 1119.5557154514. Note that the first 3 decimals coincide. The cubic root of 1253405 is about 107.8194571580.

Adding to 1253405 its reverse (5043521), we get a palindrome (6296926).

The spelling of 1253405 in words is "one million, two hundred fifty-three thousand, four hundred five".