1920864349 has 4 divisors (see below), whose sum is σ = 1929108636. Its totient is φ = 1912620064.

The previous prime is 1920864347. The next prime is 1920864373. The reversal of 1920864349 is 9434680291.

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

It can be written as a sum of positive squares in 2 ways, for example, as 282072025 + 1638792324 = 16795^2 + 40482^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920864349 - 2¹ = 1920864347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1920864299 and 1920864308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920864347) 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, 4121794 + ... + 4122259.

It is an arithmetic number, because the mean of its divisors is an integer number (482277159).

Almost surely, 2^1920864349 is an apocalyptic number.

It is an amenable number.

1920864349 is a deficient number, since it is larger than the sum of its proper divisors (8244287).

1920864349 is an equidigital number, since it uses as much as digits as its factorization.

1920864349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8244286.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 1920864349 is about 43827.6664790632. Note that the first 3 decimals coincide. The cubic root of 1920864349 is about 1243.0794836584.

The spelling of 1920864349 in words is "one billion, nine hundred twenty million, eight hundred sixty-four thousand, three hundred forty-nine".