1938668240 has 20 divisors (see below), whose sum is σ = 4507403844. Its totient is φ = 775467264.

The previous prime is 1938668191. The next prime is 1938668269. The reversal of 1938668240 is 428668391.

It can be written as a sum of positive squares in 2 ways, for example, as 525509776 + 1413158464 = 22924^2 + 37592^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12116597 + ... + 12116756.

Almost surely, 2^1938668240 is an apocalyptic number.

1938668240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1938668240 is an abundant number, since it is smaller than the sum of its proper divisors (2568735604).

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

1938668240 is a wasteful number, since it uses less digits than its factorization.

1938668240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24233366 (or 24233360 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 1938668240 is about 44030.3104690394. The cubic root of 1938668240 is about 1246.9082503722.

The spelling of 1938668240 in words is "one billion, nine hundred thirty-eight million, six hundred sixty-eight thousand, two hundred forty".