1229405 has 4 divisors (see below), whose sum is σ = 1475292. Its totient is φ = 983520.

The previous prime is 1229401. The next prime is 1229443. The reversal of 1229405 is 5049221.

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 143641 + 1085764 = 379^2 + 1042^2 .

It is not a de Polignac number, because 1229405 - 2² = 1229401 is a prime.

It is a super-3 number, since 3×1229405³ = 5574503338924815375, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229401) 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, 122936 + ... + 122945.

It is an arithmetic number, because the mean of its divisors is an integer number (368823).

2^1229405 is an apocalyptic number.

It is an amenable number.

1229405 is a deficient number, since it is larger than the sum of its proper divisors (245887).

1229405 is an equidigital number, since it uses as much as digits as its factorization.

1229405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245886.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1229405 is about 1108.7853714764. The cubic root of 1229405 is about 107.1268475550.

The spelling of 1229405 in words is "one million, two hundred twenty-nine thousand, four hundred five".