1998620893 has 2 divisors, whose sum is σ = 1998620894. Its totient is φ = 1998620892.

The previous prime is 1998620881. The next prime is 1998620917. The reversal of 1998620893 is 3980268991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1514532889 + 484088004 = 38917^2 + 22002^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998620893 is a prime.

It is a super-2 number, since 2×1998620893² = 7988970947872234898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998620803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999310446 + 999310447.

It is an arithmetic number, because the mean of its divisors is an integer number (999310447).

Almost surely, 2^1998620893 is an apocalyptic number.

It is an amenable number.

1998620893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998620893 is an equidigital number, since it uses as much as digits as its factorization.

1998620893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 1998620893 is about 44705.9380060412. The cubic root of 1998620893 is about 1259.6313889825.

The spelling of 1998620893 in words is "one billion, nine hundred ninety-eight million, six hundred twenty thousand, eight hundred ninety-three".