1990554394 has 8 divisors (see below), whose sum is σ = 2992482900. Its totient is φ = 993060096.

The previous prime is 1990554383. The next prime is 1990554451. The reversal of 1990554394 is 4934550991.

It can be written as a sum of positive squares in 2 ways, for example, as 1990498225 + 56169 = 44615^2 + 237^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1107429 + ... + 1109224.

Almost surely, 2^1990554394 is an apocalyptic number.

1990554394 is a deficient number, since it is larger than the sum of its proper divisors (1001928506).

1990554394 is a wasteful number, since it uses less digits than its factorization.

1990554394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217104.

The product of its (nonzero) digits is 874800, while the sum is 49.

The square root of 1990554394 is about 44615.6294811583. The cubic root of 1990554394 is about 1257.9344662190.

The spelling of 1990554394 in words is "one billion, nine hundred ninety million, five hundred fifty-four thousand, three hundred ninety-four".