3721297920 has 256 divisors, whose sum is σ = 12192655680. Its totient is φ = 968884224.

The previous prime is 3721297919. The next prime is 3721297927. The reversal of 3721297920 is 297921273.

It is a tau number, because it is divible by the number of its divisors (256).

It is not an unprimeable number, because it can be changed into a prime (3721297927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32931784 + ... + 32931896.

Almost surely, 2^3721297920 is an apocalyptic number.

3721297920 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 3721297920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6096327840).

3721297920 is an abundant number, since it is smaller than the sum of its proper divisors (8471357760).

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

3721297920 is an equidigital number, since it uses as much as digits as its factorization.

3721297920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 3721297920 is about 61002.4419183364. The cubic root of 3721297920 is about 1549.6423621628.

The spelling of 3721297920 in words is "three billion, seven hundred twenty-one million, two hundred ninety-seven thousand, nine hundred twenty".