1998526305 has 16 divisors (see below), whose sum is σ = 3365939520. Its totient is φ = 1009781568.

The previous prime is 1998526301. The next prime is 1998526331. The reversal of 1998526305 is 5036258991.

It is a happy number.

It is not a de Polignac number, because 1998526305 - 2² = 1998526301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1998526301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3505902 + ... + 3506471.

It is an arithmetic number, because the mean of its divisors is an integer number (210371220).

Almost surely, 2^1998526305 is an apocalyptic number.

1998526305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1998526305 is a deficient number, since it is larger than the sum of its proper divisors (1367413215).

1998526305 is a wasteful number, since it uses less digits than its factorization.

1998526305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7012400.

The product of its (nonzero) digits is 583200, while the sum is 48.

The square root of 1998526305 is about 44704.8801027360. The cubic root of 1998526305 is about 1259.6115172977.

The spelling of 1998526305 in words is "one billion, nine hundred ninety-eight million, five hundred twenty-six thousand, three hundred five".