1998004537 has 2 divisors, whose sum is σ = 1998004538. Its totient is φ = 1998004536.

The previous prime is 1998004501. The next prime is 1998004597. The reversal of 1998004537 is 7354008991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1854508096 + 143496441 = 43064^2 + 11979^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998004537 - 2¹⁹ = 1997480249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1998004597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999002268 + 999002269.

It is an arithmetic number, because the mean of its divisors is an integer number (999002269).

Almost surely, 2^1998004537 is an apocalyptic number.

It is an amenable number.

1998004537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998004537 is an equidigital number, since it uses as much as digits as its factorization.

1998004537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1998004537 is about 44699.0440278089. The cubic root of 1998004537 is about 1259.5018894878.

The spelling of 1998004537 in words is "one billion, nine hundred ninety-eight million, four thousand, five hundred thirty-seven".