1225429 has 4 divisors (see below), whose sum is σ = 1245580. Its totient is φ = 1205280.

The previous prime is 1225409. The next prime is 1225459. The reversal of 1225429 is 9245221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9245221 = 61 ⋅151561.

It can be written as a sum of positive squares in 2 ways, for example, as 91204 + 1134225 = 302^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225429 - 2⁵ = 1225397 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 (1225409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9984 + ... + 10105.

It is an arithmetic number, because the mean of its divisors is an integer number (311395).

2^1225429 is an apocalyptic number.

It is an amenable number.

1225429 is a deficient number, since it is larger than the sum of its proper divisors (20151).

1225429 is an equidigital number, since it uses as much as digits as its factorization.

1225429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20150.

The product of its digits is 1440, while the sum is 25.

The square root of 1225429 is about 1106.9909665395. The cubic root of 1225429 is about 107.0112370648.

It can be divided in two parts, 1225 and 429, that multiplied together give a palindrome (525525).

The spelling of 1225429 in words is "one million, two hundred twenty-five thousand, four hundred twenty-nine".