1990238 has 4 divisors (see below), whose sum is σ = 2985360. Its totient is φ = 995118.

The previous prime is 1990237. The next prime is 1990243. The reversal of 1990238 is 8320991.

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

It is a super-2 number, since 2×1990238² = 7922094593288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497558 + ... + 497561.

It is an arithmetic number, because the mean of its divisors is an integer number (746340).

2^1990238 is an apocalyptic number.

1990238 is a deficient number, since it is larger than the sum of its proper divisors (995122).

1990238 is an equidigital number, since it uses as much as digits as its factorization.

1990238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995121.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1990238 is about 1410.7579523079. The cubic root of 1990238 is about 125.7867814100.

The spelling of 1990238 in words is "one million, nine hundred ninety thousand, two hundred thirty-eight".