3938940 has 72 divisors (see below), whose sum is σ = 12143040. Its totient is φ = 1033344.

The previous prime is 3938939. The next prime is 3938941. The reversal of 3938940 is 498393.

It is an interprime number because it is at equal distance from previous prime (3938939) and next prime (3938941).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3938895 and 3938904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3938941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14082 + ... + 14358.

Almost surely, 2^3938940 is an apocalyptic number.

3938940 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 3938940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6071520).

3938940 is an abundant number, since it is smaller than the sum of its proper divisors (8204100).

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

3938940 is a wasteful number, since it uses less digits than its factorization.

3938940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 366 counting only the distinct ones).

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

The square root of 3938940 is about 1984.6762960241. The cubic root of 3938940 is about 157.9282374531.

The spelling of 3938940 in words is "three million, nine hundred thirty-eight thousand, nine hundred forty".