1998658725 has 48 divisors (see below), whose sum is σ = 3780472320. Its totient is φ = 912715200.

The previous prime is 1998658721. The next prime is 1998658757. The reversal of 1998658725 is 5278568991.

It is not a de Polignac number, because 1998658725 - 2² = 1998658721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998658721) 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, 827770 + ... + 830180.

It is an arithmetic number, because the mean of its divisors is an integer number (78759840).

Almost surely, 2^1998658725 is an apocalyptic number.

1998658725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1998658725 is a deficient number, since it is larger than the sum of its proper divisors (1781813595).

1998658725 is a wasteful number, since it uses less digits than its factorization.

1998658725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4010 (or 4005 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 60.

The square root of 1998658725 is about 44706.3611245648. The cubic root of 1998658725 is about 1259.6393368087.

The spelling of 1998658725 in words is "one billion, nine hundred ninety-eight million, six hundred fifty-eight thousand, seven hundred twenty-five".