3721830 has 64 divisors (see below), whose sum is σ = 10506240. Its totient is φ = 825984.

The previous prime is 3721813. The next prime is 3721847. The reversal of 3721830 is 381273.

3721830 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3721813) and next prime (3721847).

It is a self number, because there is not a number n which added to its sum of digits gives 3721830.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7531 + ... + 8009.

It is an arithmetic number, because the mean of its divisors is an integer number (164160).

Almost surely, 2^3721830 is an apocalyptic number.

3721830 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 3721830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5253120).

3721830 is an abundant number, since it is smaller than the sum of its proper divisors (6784410).

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

3721830 is a wasteful number, since it uses less digits than its factorization.

3721830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 3721830 is about 1929.2044992691. The cubic root of 3721830 is about 154.9716215823.

The spelling of 3721830 in words is "three million, seven hundred twenty-one thousand, eight hundred thirty".