1990237 has 2 divisors, whose sum is σ = 1990238. Its totient is φ = 1990236.

The previous prime is 1990229. The next prime is 1990243. The reversal of 1990237 is 7320991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1779556 + 210681 = 1334^2 + 459^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990237 - 2³ = 1990229 is a prime.

It is a super-2 number, since 2×1990237² = 7922086632338, which contains 22 as substring.

1990237 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1990199 and 1990208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995118 + 995119.

It is an arithmetic number, because the mean of its divisors is an integer number (995119).

2^1990237 is an apocalyptic number.

It is an amenable number.

1990237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990237 is an equidigital number, since it uses as much as digits as its factorization.

1990237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 1990237 is about 1410.7575978885. The cubic root of 1990237 is about 125.7867603427.

The spelling of 1990237 in words is "one million, nine hundred ninety thousand, two hundred thirty-seven".