1998337687 has 2 divisors, whose sum is σ = 1998337688. Its totient is φ = 1998337686.

The previous prime is 1998337651. The next prime is 1998337721. The reversal of 1998337687 is 7867338991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1998337687 - 2¹⁹ = 1997813399 is a prime.

It is a super-2 number, since 2×1998337687² = 7986707022569019938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998337487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999168843 + 999168844.

It is an arithmetic number, because the mean of its divisors is an integer number (999168844).

Almost surely, 2^1998337687 is an apocalyptic number.

1998337687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998337687 is an equidigital number, since it uses as much as digits as its factorization.

1998337687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13716864, while the sum is 61.

The square root of 1998337687 is about 44702.7704622432. The cubic root of 1998337687 is about 1259.5718892846.

The spelling of 1998337687 in words is "one billion, nine hundred ninety-eight million, three hundred thirty-seven thousand, six hundred eighty-seven".