3870840 has 32 divisors (see below), whose sum is σ = 11612880. Its totient is φ = 1032192.

The previous prime is 3870827. The next prime is 3870847. The reversal of 3870840 is 480783.

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 = 3870798 and 3870807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3870847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16009 + ... + 16248.

Almost surely, 2^3870840 is an apocalyptic number.

3870840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3870840 is an abundant number, since it is smaller than the sum of its proper divisors (7742040).

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

3870840 is a wasteful number, since it uses less digits than its factorization.

3870840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32271 (or 32267 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 3870840 is about 1967.4450437052. The cubic root of 3870840 is about 157.0128054250.

The spelling of 3870840 in words is "three million, eight hundred seventy thousand, eight hundred forty".