4021290 has 96 divisors (see below), whose sum is σ = 12894336. Its totient is φ = 846720.

The previous prime is 4021261. The next prime is 4021301. The reversal of 4021290 is 921204.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 7945 + ... + 8435.

It is an arithmetic number, because the mean of its divisors is an integer number (134316).

Almost surely, 2^4021290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4021290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6447168).

4021290 is an abundant number, since it is smaller than the sum of its proper divisors (8873046).

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

4021290 is a wasteful number, since it uses less digits than its factorization.

4021290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 4021290 is about 2005.3154365336. The cubic root of 4021290 is about 159.0212384113.

Adding to 4021290 its reverse (921204), we get a palindrome (4942494).

The spelling of 4021290 in words is "four million, twenty-one thousand, two hundred ninety".