1949865220 has 24 divisors (see below), whose sum is σ = 4205386584. Its totient is φ = 758866176.

The previous prime is 1949865179. The next prime is 1949865251. The reversal of 1949865220 is 225689491.

It can be written as a sum of positive squares in 4 ways, for example, as 897122304 + 1052742916 = 29952^2 + 32446^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1316737 + ... + 1318216.

It is an arithmetic number, because the mean of its divisors is an integer number (175224441).

Almost surely, 2^1949865220 is an apocalyptic number.

1949865220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1949865220 is an abundant number, since it is smaller than the sum of its proper divisors (2255521364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1949865220 is a wasteful number, since it uses less digits than its factorization.

1949865220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634999 (or 2634997 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 1949865220 is about 44157.2782222818. The cubic root of 1949865220 is about 1249.3041930207.

The spelling of 1949865220 in words is "one billion, nine hundred forty-nine million, eight hundred sixty-five thousand, two hundred twenty".