1998714905 has 48 divisors (see below), whose sum is σ = 2804254992. Its totient is φ = 1361817600.

The previous prime is 1998714901. The next prime is 1998714911. The reversal of 1998714905 is 5094178991.

It can be written as a sum of positive squares in 8 ways, for example, as 267289 + 1998447616 = 517^2 + 44704^2 .

It is not a de Polignac number, because 1998714905 - 2² = 1998714901 is a prime.

It is a super-2 number, since 2×1998714905² = 7989722542938318050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1998714901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3836045 + ... + 3836565.

It is an arithmetic number, because the mean of its divisors is an integer number (58421979).

Almost surely, 2^1998714905 is an apocalyptic number.

It is an amenable number.

1998714905 is a deficient number, since it is larger than the sum of its proper divisors (805540087).

1998714905 is a wasteful number, since it uses less digits than its factorization.

1998714905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938 (or 927 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 53.

The square root of 1998714905 is about 44706.9894423680. The cubic root of 1998714905 is about 1259.6511390362.

The spelling of 1998714905 in words is "one billion, nine hundred ninety-eight million, seven hundred fourteen thousand, nine hundred five".