3918840 has 96 divisors (see below), whose sum is σ = 12599280. Its totient is φ = 974848.

The previous prime is 3918829. The next prime is 3918851. The reversal of 3918840 is 488193.

It is an interprime number because it is at equal distance from previous prime (3918829) and next prime (3918851).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34624 + ... + 34736.

Almost surely, 2^3918840 is an apocalyptic number.

3918840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3918840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6299640).

3918840 is an abundant number, since it is smaller than the sum of its proper divisors (8680440).

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

3918840 is a wasteful number, since it uses less digits than its factorization.

3918840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 3918840 is about 1979.6060214093. The cubic root of 3918840 is about 157.6591487808.

The spelling of 3918840 in words is "three million, nine hundred eighteen thousand, eight hundred forty".