3918390 has 64 divisors (see below), whose sum is σ = 11003904. Its totient is φ = 874368.

The previous prime is 3918379. The next prime is 3918391. The reversal of 3918390 is 938193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3918391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9672 + ... + 10068.

It is an arithmetic number, because the mean of its divisors is an integer number (171936).

Almost surely, 2^3918390 is an apocalyptic number.

3918390 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 3918390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5501952).

3918390 is an abundant number, since it is smaller than the sum of its proper divisors (7085514).

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

3918390 is a wasteful number, since it uses less digits than its factorization.

3918390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 3918390 is about 1979.4923591669. The cubic root of 3918390 is about 157.6531138884.

The spelling of 3918390 in words is "three million, nine hundred eighteen thousand, three hundred ninety".