1999230997 has 4 divisors (see below), whose sum is σ = 2003870016. Its totient is φ = 1994591980.

The previous prime is 1999230979. The next prime is 1999231051. The reversal of 1999230997 is 7990329991.

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.

It is a cyclic number.

It is not a de Polignac number, because 1999230997 - 2²³ = 1990842389 is a prime.

It is a super-2 number, since 2×1999230997² = 7993849158731228018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999230197) 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, 2318863 + ... + 2319724.

It is an arithmetic number, because the mean of its divisors is an integer number (500967504).

Almost surely, 2^1999230997 is an apocalyptic number.

It is an amenable number.

1999230997 is a deficient number, since it is larger than the sum of its proper divisors (4639019).

1999230997 is an equidigital number, since it uses as much as digits as its factorization.

1999230997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639018.

The product of its (nonzero) digits is 2480058, while the sum is 58.

The square root of 1999230997 is about 44712.7610084638. The cubic root of 1999230997 is about 1259.7595486828.

The spelling of 1999230997 in words is "one billion, nine hundred ninety-nine million, two hundred thirty thousand, nine hundred ninety-seven".