1938472820 has 12 divisors (see below), whose sum is σ = 4070792964. Its totient is φ = 775389120.

The previous prime is 1938472817. The next prime is 1938472829. The reversal of 1938472820 is 282748391.

It can be written as a sum of positive squares in 2 ways, for example, as 871666576 + 1066806244 = 29524^2 + 32662^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938472829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48461801 + ... + 48461840.

It is an arithmetic number, because the mean of its divisors is an integer number (339232747).

Almost surely, 2^1938472820 is an apocalyptic number.

1938472820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1938472820 is an abundant number, since it is smaller than the sum of its proper divisors (2132320144).

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

1938472820 is a wasteful number, since it uses less digits than its factorization.

1938472820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96923650 (or 96923648 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 1938472820 is about 44028.0912600126. The cubic root of 1938472820 is about 1246.8663523666.

The spelling of 1938472820 in words is "one billion, nine hundred thirty-eight million, four hundred seventy-two thousand, eight hundred twenty".