1998961039 has 8 divisors (see below), whose sum is σ = 2077697520. Its totient is φ = 1920878400.

The previous prime is 1998961037. The next prime is 1998961057. The reversal of 1998961039 is 9301698991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1998961039 - 2¹ = 1998961037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998961037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157222 + ... + 169459.

It is an arithmetic number, because the mean of its divisors is an integer number (259712190).

Almost surely, 2^1998961039 is an apocalyptic number.

1998961039 is a deficient number, since it is larger than the sum of its proper divisors (78736481).

1998961039 is a wasteful number, since it uses less digits than its factorization.

1998961039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326921.

The product of its (nonzero) digits is 944784, while the sum is 55.

The square root of 1998961039 is about 44709.7421039308. The cubic root of 1998961039 is about 1259.7028439669.

The spelling of 1998961039 in words is "one billion, nine hundred ninety-eight million, nine hundred sixty-one thousand, thirty-nine".