1990000239 has 4 divisors (see below), whose sum is σ = 2653333656. Its totient is φ = 1326666824.

The previous prime is 1990000219. The next prime is 1990000241. The reversal of 1990000239 is 9320000991.

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

It is a cyclic number.

It is not a de Polignac number, because 1990000239 - 2⁸ = 1989999983 is a prime.

1990000239 is a modest number, since divided by 239 gives 199 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990000219) 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, 331666704 + ... + 331666709.

It is an arithmetic number, because the mean of its divisors is an integer number (663333414).

Almost surely, 2^1990000239 is an apocalyptic number.

1990000239 is a deficient number, since it is larger than the sum of its proper divisors (663333417).

1990000239 is an equidigital number, since it uses as much as digits as its factorization.

1990000239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663333416.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 1990000239 is about 44609.4187251975. The cubic root of 1990000239 is about 1257.8177222984.

The spelling of 1990000239 in words is "one billion, nine hundred ninety million, two hundred thirty-nine", and thus it is an aban number.