1998037 has 4 divisors (see below), whose sum is σ = 2052076. Its totient is φ = 1944000.

The previous prime is 1998023. The next prime is 1998041. The reversal of 1998037 is 7308991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1153476 + 844561 = 1074^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998037 - 2¹¹ = 1995989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 54001 = 1998037 / (1 + 9 + 9 + 8 + 0 + 3 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997987 and 1998005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26964 + ... + 27037.

It is an arithmetic number, because the mean of its divisors is an integer number (513019).

2^1998037 is an apocalyptic number.

It is an amenable number.

1998037 is a deficient number, since it is larger than the sum of its proper divisors (54039).

1998037 is an equidigital number, since it uses as much as digits as its factorization.

1998037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54038.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1998037 is about 1413.5193666873. The cubic root of 1998037 is about 125.9508710792.

The spelling of 1998037 in words is "one million, nine hundred ninety-eight thousand, thirty-seven".