990473489 has 4 divisors (see below), whose sum is σ = 991695600. Its totient is φ = 989251380.

The previous prime is 990473459. The next prime is 990473503. The reversal of 990473489 is 984374099.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 990473489 - 2²⁰ = 989424913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990473489.

It is not an unprimeable number, because it can be changed into a prime (990473459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609839 + ... + 611460.

It is an arithmetic number, because the mean of its divisors is an integer number (247923900).

Almost surely, 2^990473489 is an apocalyptic number.

It is an amenable number.

990473489 is a deficient number, since it is larger than the sum of its proper divisors (1222111).

990473489 is a wasteful number, since it uses less digits than its factorization.

990473489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222110.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 990473489 is about 31471.7887797945. The cubic root of 990473489 is about 996.8143587998.

The spelling of 990473489 in words is "nine hundred ninety million, four hundred seventy-three thousand, four hundred eighty-nine".