1998025490 has 16 divisors (see below), whose sum is σ = 3604798080. Its totient is φ = 797354160.

The previous prime is 1998025457. The next prime is 1998025517. The reversal of 1998025490 is 945208991.

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, 227480 + ... + 236099.

It is an arithmetic number, because the mean of its divisors is an integer number (225299880).

Almost surely, 2^1998025490 is an apocalyptic number.

1998025490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998025490 is a deficient number, since it is larger than the sum of its proper divisors (1606772590).

1998025490 is a wasteful number, since it uses less digits than its factorization.

1998025490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464017.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 1998025490 is about 44699.2784058087. The cubic root of 1998025490 is about 1259.5062922557.

The spelling of 1998025490 in words is "one billion, nine hundred ninety-eight million, twenty-five thousand, four hundred ninety".