1990581473 has 8 divisors (see below), whose sum is σ = 2033904168. Its totient is φ = 1947472384.

The previous prime is 1990581433. The next prime is 1990581479. The reversal of 1990581473 is 3741850991.

It can be written as a sum of positive squares in 4 ways, for example, as 1061977744 + 928603729 = 32588^2 + 30473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1990581473 - 2¹⁴ = 1990565089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990581479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34490 + ... + 71907.

It is an arithmetic number, because the mean of its divisors is an integer number (254238021).

Almost surely, 2^1990581473 is an apocalyptic number.

It is an amenable number.

1990581473 is a deficient number, since it is larger than the sum of its proper divisors (43322695).

1990581473 is a wasteful number, since it uses less digits than its factorization.

1990581473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106803.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 1990581473 is about 44615.9329500124. The cubic root of 1990581473 is about 1257.9401704009.

The spelling of 1990581473 in words is "one billion, nine hundred ninety million, five hundred eighty-one thousand, four hundred seventy-three".