1990599497 has 4 divisors (see below), whose sum is σ = 2054812416. Its totient is φ = 1926386580.

The previous prime is 1990599463. The next prime is 1990599503. The reversal of 1990599497 is 7949950991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7949950991 = 4001 ⋅1986991.

It is a cyclic number.

It is not a de Polignac number, because 1990599497 - 2²² = 1986405193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990599197) 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, 32106413 + ... + 32106474.

It is an arithmetic number, because the mean of its divisors is an integer number (513703104).

Almost surely, 2^1990599497 is an apocalyptic number.

It is an amenable number.

1990599497 is a deficient number, since it is larger than the sum of its proper divisors (64212919).

1990599497 is an equidigital number, since it uses as much as digits as its factorization.

1990599497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64212918.

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

The square root of 1990599497 is about 44616.1349401761. The cubic root of 1990599497 is about 1257.9439671215.

The spelling of 1990599497 in words is "one billion, nine hundred ninety million, five hundred ninety-nine thousand, four hundred ninety-seven".