3856640440 has 16 divisors (see below), whose sum is σ = 8677441080. Its totient is φ = 1542656160.

The previous prime is 3856640423. The next prime is 3856640461. The reversal of 3856640440 is 440466583.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 96416011 = 3856640440 / (3 + 8 + 5 + 6 + 6 + 4 + 0 + 4 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 3856640393 and 3856640402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48207966 + ... + 48208045.

Almost surely, 2^3856640440 is an apocalyptic number.

It is an amenable number.

3856640440 is an abundant number, since it is smaller than the sum of its proper divisors (4820800640).

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

3856640440 is a wasteful number, since it uses less digits than its factorization.

3856640440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96416022 (or 96416018 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The square root of 3856640440 is about 62101.8553668085. The cubic root of 3856640440 is about 1568.2057802519.

The spelling of 3856640440 in words is "three billion, eight hundred fifty-six million, six hundred forty thousand, four hundred forty".