1228429 has 2 divisors, whose sum is σ = 1228430. Its totient is φ = 1228428.

The previous prime is 1228399. The next prime is 1228441. The reversal of 1228429 is 9248221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643204 + 585225 = 802^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228429 - 2⁵ = 1228397 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1228397 and 1228406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614214 + 614215.

It is an arithmetic number, because the mean of its divisors is an integer number (614215).

2^1228429 is an apocalyptic number.

It is an amenable number.

1228429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228429 is an equidigital number, since it uses as much as digits as its factorization.

1228429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

The square root of 1228429 is about 1108.3451628441. The cubic root of 1228429 is about 107.0984914305.

It can be divided in two parts, 12 and 28429, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 1228429 in words is "one million, two hundred twenty-eight thousand, four hundred twenty-nine".