1998704465 has 16 divisors (see below), whose sum is σ = 2457880848. Its totient is φ = 1559690496.

The previous prime is 1998704431. The next prime is 1998704507. The reversal of 1998704465 is 5644078991.

It can be written as a sum of positive squares in 8 ways, for example, as 8473921 + 1990230544 = 2911^2 + 44612^2 .

It is not a de Polignac number, because 1998704465 - 2¹⁸ = 1998442321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 24047 + ... + 67643.

It is an arithmetic number, because the mean of its divisors is an integer number (153617553).

Almost surely, 2^1998704465 is an apocalyptic number.

It is an amenable number.

1998704465 is a deficient number, since it is larger than the sum of its proper divisors (459176383).

1998704465 is a wasteful number, since it uses less digits than its factorization.

1998704465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43828.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 1998704465 is about 44706.8726819490. The cubic root of 1998704465 is about 1259.6489458301.

The spelling of 1998704465 in words is "one billion, nine hundred ninety-eight million, seven hundred four thousand, four hundred sixty-five".