1949778220 has 24 divisors (see below), whose sum is σ = 4409499024. Its totient is φ = 719918016.

The previous prime is 1949778217. The next prime is 1949778239. The reversal of 1949778220 is 228779491.

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, 3749314 + ... + 3749833.

It is an arithmetic number, because the mean of its divisors is an integer number (183729126).

Almost surely, 2^1949778220 is an apocalyptic number.

1949778220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1949778220 is an abundant number, since it is smaller than the sum of its proper divisors (2459720804).

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

1949778220 is a wasteful number, since it uses less digits than its factorization.

1949778220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7499169 (or 7499167 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 1949778220 is about 44156.2930962281. The cubic root of 1949778220 is about 1249.2856120643.

The spelling of 1949778220 in words is "one billion, nine hundred forty-nine million, seven hundred seventy-eight thousand, two hundred twenty".