428293493 has 2 divisors, whose sum is σ = 428293494. Its totient is φ = 428293492.

The previous prime is 428293487. The next prime is 428293507. The reversal of 428293493 is 394392824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 425060689 + 3232804 = 20617^2 + 1798^2 .

It is a cyclic number.

It is not a de Polignac number, because 428293493 - 2¹⁶ = 428227957 is a prime.

It is a super-2 number, since 2×428293493² = 366870632292282098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428293423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214146746 + 214146747.

It is an arithmetic number, because the mean of its divisors is an integer number (214146747).

Almost surely, 2^428293493 is an apocalyptic number.

It is an amenable number.

428293493 is a deficient number, since it is larger than the sum of its proper divisors (1).

428293493 is an equidigital number, since it uses as much as digits as its factorization.

428293493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 44.

The square root of 428293493 is about 20695.2529097859. The cubic root of 428293493 is about 753.7844234742.

The spelling of 428293493 in words is "four hundred twenty-eight million, two hundred ninety-three thousand, four hundred ninety-three".