3940220 has 24 divisors (see below), whose sum is σ = 8710800. Its totient is φ = 1492992.

The previous prime is 3940217. The next prime is 3940231. The reversal of 3940220 is 220493.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3940192 and 3940201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4805 + ... + 5564.

It is an arithmetic number, because the mean of its divisors is an integer number (362950).

Almost surely, 2^3940220 is an apocalyptic number.

It is an amenable number.

3940220 is an abundant number, since it is smaller than the sum of its proper divisors (4770580).

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

3940220 is a wasteful number, since it uses less digits than its factorization.

3940220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397 (or 10395 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 3940220 is about 1984.9987405538. The cubic root of 3940220 is about 157.9453424146.

The spelling of 3940220 in words is "three million, nine hundred forty thousand, two hundred twenty".