3921390 has 96 divisors (see below), whose sum is σ = 11827296. Its totient is φ = 890880.

The previous prime is 3921383. The next prime is 3921413. The reversal of 3921390 is 931293.

3921390 = T₄₀₀ + T₄₀₁ + ... + T₄₄₃.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16714 + ... + 16946.

It is an arithmetic number, because the mean of its divisors is an integer number (123201).

Almost surely, 2^3921390 is an apocalyptic number.

3921390 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 3921390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5913648).

3921390 is an abundant number, since it is smaller than the sum of its proper divisors (7905906).

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

3921390 is a wasteful number, since it uses less digits than its factorization.

3921390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 3921390 is about 1980.2499842192. The cubic root of 3921390 is about 157.6933377806.

The spelling of 3921390 in words is "three million, nine hundred twenty-one thousand, three hundred ninety".