1017998890 has 32 divisors (see below), whose sum is σ = 1903986000. Its totient is φ = 391415808.

The previous prime is 1017998873. The next prime is 1017998893. The reversal of 1017998890 is 988997101.

It can be written as a sum of positive squares in 8 ways, for example, as 471888729 + 546110161 = 21723^2 + 23369^2 .

It is not an unprimeable number, because it can be changed into a prime (1017998893) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 58746 + ... + 74074.

Almost surely, 2^1017998890 is an apocalyptic number.

1017998890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1017998890 is a deficient number, since it is larger than the sum of its proper divisors (885987110).

1017998890 is a wasteful number, since it uses less digits than its factorization.

1017998890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15594.

The product of its (nonzero) digits is 326592, while the sum is 52.

The square root of 1017998890 is about 31906.0948722967. The cubic root of 1017998890 is about 1005.9639901106.

The spelling of 1017998890 in words is "one billion, seventeen million, nine hundred ninety-eight thousand, eight hundred ninety".