1998902965 has 4 divisors (see below), whose sum is σ = 2398683564. Its totient is φ = 1599122368.

The previous prime is 1998902963. The next prime is 1998902977. The reversal of 1998902965 is 5692098991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5692098991 = 103 ⋅55263097.

It can be written as a sum of positive squares in 2 ways, for example, as 1392857041 + 606045924 = 37321^2 + 24618^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998902965 - 2¹ = 1998902963 is a prime.

It is a super-2 number, since 2×1998902965² = 7991226126971582450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998902963) 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, 199890292 + ... + 199890301.

It is an arithmetic number, because the mean of its divisors is an integer number (599670891).

Almost surely, 2^1998902965 is an apocalyptic number.

It is an amenable number.

1998902965 is a deficient number, since it is larger than the sum of its proper divisors (399780599).

1998902965 is an equidigital number, since it uses as much as digits as its factorization.

1998902965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399780598.

The product of its (nonzero) digits is 3149280, while the sum is 58.

The square root of 1998902965 is about 44709.0926434433. The cubic root of 1998902965 is about 1259.6906448478.

The spelling of 1998902965 in words is "one billion, nine hundred ninety-eight million, nine hundred two thousand, nine hundred sixty-five".