1998914965 has 4 divisors (see below), whose sum is σ = 2398697964. Its totient is φ = 1599131968.

The previous prime is 1998914963. The next prime is 1998914971. The reversal of 1998914965 is 5694198991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1030024836 + 968890129 = 32094^2 + 31127^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998914965 - 2¹ = 1998914963 is a prime.

It is a super-2 number, since 2×1998914965² = 7991322074601902450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998914963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199891492 + ... + 199891501.

It is an arithmetic number, because the mean of its divisors is an integer number (599674491).

Almost surely, 2^1998914965 is an apocalyptic number.

It is an amenable number.

1998914965 is a deficient number, since it is larger than the sum of its proper divisors (399782999).

1998914965 is an equidigital number, since it uses as much as digits as its factorization.

1998914965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399782998.

The product of its digits is 6298560, while the sum is 61.

The square root of 1998914965 is about 44709.2268441314. The cubic root of 1998914965 is about 1259.6931656068.

The spelling of 1998914965 in words is "one billion, nine hundred ninety-eight million, nine hundred fourteen thousand, nine hundred sixty-five".