3972207420 has 144 divisors (see below), whose sum is σ = 12809972448. Its totient is φ = 992870400.

The previous prime is 3972207361. The next prime is 3972207427. The reversal of 3972207420 is 247022793.

3972207420 is a `hidden beast` number, since 3 + 9 + 7 + 220 + 7 + 420 = 666.

3972207420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3972207427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 783895 + ... + 788945.

It is an arithmetic number, because the mean of its divisors is an integer number (88958142).

Almost surely, 2^3972207420 is an apocalyptic number.

3972207420 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 3972207420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6404986224).

3972207420 is an abundant number, since it is smaller than the sum of its proper divisors (8837765028).

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

3972207420 is a wasteful number, since it uses less digits than its factorization.

3972207420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5340 (or 5335 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 3972207420 is about 63025.4505735580. The cubic root of 3972207420 is about 1583.7160064400.

The spelling of 3972207420 in words is "three billion, nine hundred seventy-two million, two hundred seven thousand, four hundred twenty".