3891688440 has 64 divisors (see below), whose sum is σ = 11784216960. Its totient is φ = 1028081280.

The previous prime is 3891688417. The next prime is 3891688459. The reversal of 3891688440 is 448861983.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138706 + ... + 164385.

It is an arithmetic number, because the mean of its divisors is an integer number (184128390).

Almost surely, 2^3891688440 is an apocalyptic number.

3891688440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3891688440 is an abundant number, since it is smaller than the sum of its proper divisors (7892528520).

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

3891688440 is a wasteful number, since it uses less digits than its factorization.

3891688440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303212 (or 303208 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 51.

The square root of 3891688440 is about 62383.3987531939. The cubic root of 3891688440 is about 1572.9419246032.

The spelling of 3891688440 in words is "three billion, eight hundred ninety-one million, six hundred eighty-eight thousand, four hundred forty".