3838640840 has 16 divisors (see below), whose sum is σ = 8636941980. Its totient is φ = 1535456320.

The previous prime is 3838640803. The next prime is 3838640857. The reversal of 3838640840 is 480468383.

It can be written as a sum of positive squares in 2 ways, for example, as 3627171076 + 211469764 = 60226^2 + 14542^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3838640791 and 3838640800.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 47982971 + ... + 47983050.

Almost surely, 2^3838640840 is an apocalyptic number.

It is an amenable number.

3838640840 is an abundant number, since it is smaller than the sum of its proper divisors (4798301140).

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

3838640840 is a wasteful number, since it uses less digits than its factorization.

3838640840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95966032 (or 95966028 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 44.

The square root of 3838640840 is about 61956.7658936455. The cubic root of 3838640840 is about 1565.7622800993.

The spelling of 3838640840 in words is "three billion, eight hundred thirty-eight million, six hundred forty thousand, eight hundred forty".