1990332621 has 16 divisors (see below), whose sum is σ = 2979043200. Its totient is φ = 1313207424.

The previous prime is 1990332607. The next prime is 1990332637. The reversal of 1990332621 is 1262330991.

It is a happy number.

It is not a de Polignac number, because 1990332621 - 2⁹ = 1990332109 is a prime.

It is a super-2 number, since 2×1990332621² = 7922847884433459282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990331621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377361 + ... + 382598.

It is an arithmetic number, because the mean of its divisors is an integer number (186190200).

Almost surely, 2^1990332621 is an apocalyptic number.

It is an amenable number.

1990332621 is a deficient number, since it is larger than the sum of its proper divisors (988710579).

1990332621 is an equidigital number, since it uses as much as digits as its factorization.

1990332621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760065 (or 760059 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 1990332621 is about 44613.1440385006. The cubic root of 1990332621 is about 1257.8877478672.

The spelling of 1990332621 in words is "one billion, nine hundred ninety million, three hundred thirty-two thousand, six hundred twenty-one".