819427457 has 6 divisors (see below), whose sum is σ = 833084694. Its totient is φ = 805990560.

The previous prime is 819427423. The next prime is 819427471. The reversal of 819427457 is 754724918.

It can be written as a sum of positive squares in 3 ways, for example, as 17631601 + 801795856 = 4199^2 + 28316^2 .

It is not a de Polignac number, because 819427457 - 2¹⁸ = 819165313 is a prime.

It is a super-2 number, since 2×819427457² = 1342922714570973698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819427057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106388 + ... + 113829.

It is an arithmetic number, because the mean of its divisors is an integer number (138847449).

Almost surely, 2^819427457 is an apocalyptic number.

It is an amenable number.

819427457 is a deficient number, since it is larger than the sum of its proper divisors (13657237).

819427457 is an equidigital number, since it uses as much as digits as its factorization.

819427457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220339 (or 220278 counting only the distinct ones).

The product of its digits is 564480, while the sum is 47.

The square root of 819427457 is about 28625.6433464822. The cubic root of 819427457 is about 935.7722682537.

The spelling of 819427457 in words is "eight hundred nineteen million, four hundred twenty-seven thousand, four hundred fifty-seven".