1938354440 has 64 divisors (see below), whose sum is σ = 4964664960. Its totient is φ = 674206720.

The previous prime is 1938354413. The next prime is 1938354443. The reversal of 1938354440 is 444538391.

It is not an unprimeable number, because it can be changed into a prime (1938354443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85649 + ... + 105888.

It is an arithmetic number, because the mean of its divisors is an integer number (77572890).

Almost surely, 2^1938354440 is an apocalyptic number.

1938354440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1938354440 is an abundant number, since it is smaller than the sum of its proper divisors (3026310520).

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

1938354440 is a wasteful number, since it uses less digits than its factorization.

1938354440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191582 (or 191578 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 1938354440 is about 44026.7468705104. The cubic root of 1938354440 is about 1246.8409703508.

The spelling of 1938354440 in words is "one billion, nine hundred thirty-eight million, three hundred fifty-four thousand, four hundred forty".