1990748959 has 4 divisors (see below), whose sum is σ = 2095525240. Its totient is φ = 1885972680.

The previous prime is 1990748951. The next prime is 1990748989. The reversal of 1990748959 is 9598470991.

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

It is not a de Polignac number, because 1990748959 - 2³ = 1990748951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1990748897 and 1990748906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990748951) 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, 52388112 + ... + 52388149.

It is an arithmetic number, because the mean of its divisors is an integer number (523881310).

Almost surely, 2^1990748959 is an apocalyptic number.

1990748959 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1990748959 is a deficient number, since it is larger than the sum of its proper divisors (104776281).

1990748959 is a wasteful number, since it uses less digits than its factorization.

1990748959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104776280.

The product of its (nonzero) digits is 7348320, while the sum is 61.

The square root of 1990748959 is about 44617.8098857396. The cubic root of 1990748959 is about 1257.9754501188.

The spelling of 1990748959 in words is "one billion, nine hundred ninety million, seven hundred forty-eight thousand, nine hundred fifty-nine".