819428949 has 6 divisors (see below), whose sum is σ = 1183619606. Its totient is φ = 546285960.

The previous prime is 819428893. The next prime is 819428957. The reversal of 819428949 is 949824918.

It can be written as a sum of positive squares in only one way, i.e., 796932900 + 22496049 = 28230^2 + 4743^2 .

It is not a de Polignac number, because 819428949 - 2¹⁹ = 818904661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 819428895 and 819428904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819420949) 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, 45523822 + ... + 45523839.

Almost surely, 2^819428949 is an apocalyptic number.

It is an amenable number.

819428949 is a deficient number, since it is larger than the sum of its proper divisors (364190657).

819428949 is a wasteful number, since it uses less digits than its factorization.

819428949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91047667 (or 91047664 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 819428949 is about 28625.6694070200. The cubic root of 819428949 is about 935.7728361996.

The spelling of 819428949 in words is "eight hundred nineteen million, four hundred twenty-eight thousand, nine hundred forty-nine".