3943890 has 56 divisors (see below), whose sum is σ = 10663308. Its totient is φ = 1049760.

The previous prime is 3943883. The next prime is 3943921. The reversal of 3943890 is 983493.

It can be written as a sum of positive squares in 2 ways, for example, as 3884841 + 59049 = 1971^2 + 243^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 7020 + ... + 7560.

Almost surely, 2^3943890 is an apocalyptic number.

3943890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3943890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5331654).

3943890 is an abundant number, since it is smaller than the sum of its proper divisors (6719418).

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

3943890 is an equidigital number, since it uses as much as digits as its factorization.

3943890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 3943890 is about 1985.9229592308. The cubic root of 3943890 is about 157.9943650183.

The spelling of 3943890 in words is "three million, nine hundred forty-three thousand, eight hundred ninety".