1890318538 has 4 divisors (see below), whose sum is σ = 2835477810. Its totient is φ = 945159268.

The previous prime is 1890318533. The next prime is 1890318559. The reversal of 1890318538 is 8358130981.

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

It can be written as a sum of positive squares in only one way, i.e., 1559697049 + 330621489 = 39493^2 + 18183^2 .

It is not an unprimeable number, because it can be changed into a prime (1890318533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472579633 + ... + 472579636.

Almost surely, 2^1890318538 is an apocalyptic number.

1890318538 is a deficient number, since it is larger than the sum of its proper divisors (945159272).

1890318538 is an equidigital number, since it uses as much as digits as its factorization.

1890318538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945159271.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 1890318538 is about 43477.7936192719. The cubic root of 1890318538 is about 1236.4550456162.

The spelling of 1890318538 in words is "one billion, eight hundred ninety million, three hundred eighteen thousand, five hundred thirty-eight".