1990387148 has 24 divisors (see below), whose sum is σ = 3593844240. Its totient is φ = 963924480.

The previous prime is 1990387043. The next prime is 1990387151. The reversal of 1990387148 is 8417830991.

It is a junction number, because it is equal to n+sod(n) for n = 1990387096 and 1990387105.

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 7 ways as a sum of consecutive naturals, for example, 20861 + ... + 66452.

It is an arithmetic number, because the mean of its divisors is an integer number (149743510).

Almost surely, 2^1990387148 is an apocalyptic number.

It is an amenable number.

1990387148 is a deficient number, since it is larger than the sum of its proper divisors (1603457092).

1990387148 is a wasteful number, since it uses less digits than its factorization.

1990387148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87497 (or 87495 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 1990387148 is about 44613.7551434532. The cubic root of 1990387148 is about 1257.8992347611.

The spelling of 1990387148 in words is "one billion, nine hundred ninety million, three hundred eighty-seven thousand, one hundred forty-eight".