1990215937 has 2 divisors, whose sum is σ = 1990215938. Its totient is φ = 1990215936.

The previous prime is 1990215923. The next prime is 1990215979. The reversal of 1990215937 is 7395120991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1381162896 + 609053041 = 37164^2 + 24679^2 .

It is an emirp because it is prime and its reverse (7395120991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1990215937 - 2²³ = 1981827329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1990212937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995107968 + 995107969.

It is an arithmetic number, because the mean of its divisors is an integer number (995107969).

Almost surely, 2^1990215937 is an apocalyptic number.

It is an amenable number.

1990215937 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990215937 is an equidigital number, since it uses as much as digits as its factorization.

1990215937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 1990215937 is about 44611.8362881422. The cubic root of 1990215937 is about 1257.8631660057.

The spelling of 1990215937 in words is "one billion, nine hundred ninety million, two hundred fifteen thousand, nine hundred thirty-seven".