428621429 has 2 divisors, whose sum is σ = 428621430. Its totient is φ = 428621428.

The previous prime is 428621359. The next prime is 428621443. The reversal of 428621429 is 924126824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 357134404 + 71487025 = 18898^2 + 8455^2 .

It is a cyclic number.

It is not a de Polignac number, because 428621429 - 2²⁰ = 427572853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 428621392 and 428621401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428621729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214310714 + 214310715.

It is an arithmetic number, because the mean of its divisors is an integer number (214310715).

Almost surely, 2^428621429 is an apocalyptic number.

It is an amenable number.

428621429 is a deficient number, since it is larger than the sum of its proper divisors (1).

428621429 is an equidigital number, since it uses as much as digits as its factorization.

428621429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 428621429 is about 20703.1743701298. The cubic root of 428621429 is about 753.9767604186.

The spelling of 428621429 in words is "four hundred twenty-eight million, six hundred twenty-one thousand, four hundred twenty-nine".