1985298990 has 32 divisors (see below), whose sum is σ = 4766138496. Its totient is φ = 529255200.

The previous prime is 1985298983. The next prime is 1985299003. The reversal of 1985298990 is 998925891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120765 + ... + 136215.

It is an arithmetic number, because the mean of its divisors is an integer number (148941828).

Almost surely, 2^1985298990 is an apocalyptic number.

1985298990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1985298990 is an abundant number, since it is smaller than the sum of its proper divisors (2780839506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1985298990 is a wasteful number, since it uses less digits than its factorization.

1985298990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19744.

The product of its (nonzero) digits is 4199040, while the sum is 60.

The square root of 1985298990 is about 44556.6941098641. The cubic root of 1985298990 is about 1256.8264364811.

The spelling of 1985298990 in words is "one billion, nine hundred eighty-five million, two hundred ninety-eight thousand, nine hundred ninety".