3856440 has 64 divisors (see below), whose sum is σ = 13224960. Its totient is φ = 881280.

The previous prime is 3856409. The next prime is 3856451. The reversal of 3856440 is 446583.

3856440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 3856398 and 3856407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1456 + ... + 3135.

It is an arithmetic number, because the mean of its divisors is an integer number (206640).

Almost surely, 2^3856440 is an apocalyptic number.

3856440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3856440 is an abundant number, since it is smaller than the sum of its proper divisors (9368520).

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

3856440 is a wasteful number, since it uses less digits than its factorization.

3856440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4612 (or 4608 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 3856440 is about 1963.7820653015. The cubic root of 3856440 is about 156.8178611821.

The spelling of 3856440 in words is "three million, eight hundred fifty-six thousand, four hundred forty".