1990484021 has 8 divisors (see below), whose sum is σ = 2017094400. Its totient is φ = 1963968160.

The previous prime is 1990484017. The next prime is 1990484029. The reversal of 1990484021 is 1204840991.

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 1990484021 - 2² = 1990484017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990484029) 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, 19286 + ... + 65976.

It is an arithmetic number, because the mean of its divisors is an integer number (252136800).

Almost surely, 2^1990484021 is an apocalyptic number.

It is an amenable number.

1990484021 is a deficient number, since it is larger than the sum of its proper divisors (26610379).

1990484021 is an equidigital number, since it uses as much as digits as its factorization.

1990484021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47259.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1990484021 is about 44614.8408155851. The cubic root of 1990484021 is about 1257.9196419292.

The spelling of 1990484021 in words is "one billion, nine hundred ninety million, four hundred eighty-four thousand, twenty-one".