1990572839 has 4 divisors (see below), whose sum is σ = 1991120520. Its totient is φ = 1990025160.

The previous prime is 1990572799. The next prime is 1990572841. The reversal of 1990572839 is 9382750991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9382750991 = 15887 ⋅590593.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990572839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990572889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268352 + ... + 275669.

It is an arithmetic number, because the mean of its divisors is an integer number (497780130).

Almost surely, 2^1990572839 is an apocalyptic number.

1990572839 is a deficient number, since it is larger than the sum of its proper divisors (547681).

1990572839 is an equidigital number, since it uses as much as digits as its factorization.

1990572839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547680.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 1990572839 is about 44615.8361907518. The cubic root of 1990572839 is about 1257.9383516574.

The spelling of 1990572839 in words is "one billion, nine hundred ninety million, five hundred seventy-two thousand, eight hundred thirty-nine".