1228428493 has 2 divisors, whose sum is σ = 1228428494. Its totient is φ = 1228428492.

The previous prime is 1228428427. The next prime is 1228428503. The reversal of 1228428493 is 3948248221.

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., 1011367204 + 217061289 = 31802^2 + 14733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228428493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228458493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614214246 + 614214247.

It is an arithmetic number, because the mean of its divisors is an integer number (614214247).

Almost surely, 2^1228428493 is an apocalyptic number.

It is an amenable number.

1228428493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228428493 is an equidigital number, since it uses as much as digits as its factorization.

1228428493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 43.

The square root of 1228428493 is about 35048.9442494350. The cubic root of 1228428493 is about 1070.9847669654.

The spelling of 1228428493 in words is "one billion, two hundred twenty-eight million, four hundred twenty-eight thousand, four hundred ninety-three".