3938220 has 240 divisors, whose sum is σ = 15367968. Its totient is φ = 829440.

The previous prime is 3938197. The next prime is 3938251. The reversal of 3938220 is 228393.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 231652 + ... + 231668.

Almost surely, 2^3938220 is an apocalyptic number.

3938220 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 3938220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7683984).

3938220 is an abundant number, since it is smaller than the sum of its proper divisors (11429748).

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

3938220 is a wasteful number, since it uses less digits than its factorization.

3938220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 3938220 is about 1984.4948979526. The cubic root of 3938220 is about 157.9186142837.

The spelling of 3938220 in words is "three million, nine hundred thirty-eight thousand, two hundred twenty".