1998357037 has 2 divisors, whose sum is σ = 1998357038. Its totient is φ = 1998357036.

The previous prime is 1998357029. The next prime is 1998357079. The reversal of 1998357037 is 7307538991.

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., 1544411401 + 453945636 = 39299^2 + 21306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998357037 - 2³ = 1998357029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998357007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999178518 + 999178519.

It is an arithmetic number, because the mean of its divisors is an integer number (999178519).

Almost surely, 2^1998357037 is an apocalyptic number.

It is an amenable number.

1998357037 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998357037 is an equidigital number, since it uses as much as digits as its factorization.

1998357037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The square root of 1998357037 is about 44702.9868912582. The cubic root of 1998357037 is about 1259.5759547699.

The spelling of 1998357037 in words is "one billion, nine hundred ninety-eight million, three hundred fifty-seven thousand, thirty-seven".