1990161439 has 8 divisors (see below), whose sum is σ = 2335942688. Its totient is φ = 1659748320.

The previous prime is 1990161413. The next prime is 1990161449. The reversal of 1990161439 is 9341610991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1990161439 - 2⁹ = 1990160927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1990161395 and 1990161404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990161409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3841752 + ... + 3842269.

It is an arithmetic number, because the mean of its divisors is an integer number (291992836).

Almost surely, 2^1990161439 is an apocalyptic number.

1990161439 is a deficient number, since it is larger than the sum of its proper divisors (345781249).

1990161439 is an equidigital number, since it uses as much as digits as its factorization.

1990161439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7684065.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 1990161439 is about 44611.2254819345. The cubic root of 1990161439 is about 1257.8516845627.

The spelling of 1990161439 in words is "one billion, nine hundred ninety million, one hundred sixty-one thousand, four hundred thirty-nine".