1989066457 has 12 divisors (see below), whose sum is σ = 2316718260. Its totient is φ = 1702772736.

The previous prime is 1989066449. The next prime is 1989066463. The reversal of 1989066457 is 7546609891.

It can be written as a sum of positive squares in 2 ways, for example, as 1924489161 + 64577296 = 43869^2 + 8036^2 .

It is not a de Polignac number, because 1989066457 - 2³ = 1989066449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1989066398 and 1989066407.

It is not an unprimeable number, because it can be changed into a prime (1989066257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14553 + ... + 64729.

It is an arithmetic number, because the mean of its divisors is an integer number (193059855).

Almost surely, 2^1989066457 is an apocalyptic number.

It is an amenable number.

1989066457 is a deficient number, since it is larger than the sum of its proper divisors (327651803).

1989066457 is an equidigital number, since it uses as much as digits as its factorization.

1989066457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51000 (or 50993 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 55.

The square root of 1989066457 is about 44598.9512993299. The cubic root of 1989066457 is about 1257.6209532589.

The spelling of 1989066457 in words is "one billion, nine hundred eighty-nine million, sixty-six thousand, four hundred fifty-seven".