1990497599 has 4 divisors (see below), whose sum is σ = 2008112736. Its totient is φ = 1972882464.

The previous prime is 1990497571. The next prime is 1990497637. The reversal of 1990497599 is 9957940991.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990497599 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 (1990497559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8807399 + ... + 8807624.

It is an arithmetic number, because the mean of its divisors is an integer number (502028184).

Almost surely, 2^1990497599 is an apocalyptic number.

1990497599 is a deficient number, since it is larger than the sum of its proper divisors (17615137).

1990497599 is a wasteful number, since it uses less digits than its factorization.

1990497599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17615136.

The product of its (nonzero) digits is 8266860, while the sum is 62.

The square root of 1990497599 is about 44614.9929844217. The cubic root of 1990497599 is about 1257.9225022041.

The spelling of 1990497599 in words is "one billion, nine hundred ninety million, four hundred ninety-seven thousand, five hundred ninety-nine".