1428638369 has 2 divisors, whose sum is σ = 1428638370. Its totient is φ = 1428638368.

The previous prime is 1428638359. The next prime is 1428638381. The reversal of 1428638369 is 9638368241.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776346769 + 652291600 = 27863^2 + 25540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428638369 is a prime.

It is a super-2 number, since 2×1428638369² = 4082015178757960322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1428638359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714319184 + 714319185.

It is an arithmetic number, because the mean of its divisors is an integer number (714319185).

Almost surely, 2^1428638369 is an apocalyptic number.

It is an amenable number.

1428638369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428638369 is an equidigital number, since it uses as much as digits as its factorization.

1428638369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 50.

The square root of 1428638369 is about 37797.3328291825. The cubic root of 1428638369 is about 1126.2654715225.

The spelling of 1428638369 in words is "one billion, four hundred twenty-eight million, six hundred thirty-eight thousand, three hundred sixty-nine".