3721178340 has 144 divisors (see below), whose sum is σ = 12725354880. Its totient is φ = 902088000.

The previous prime is 3721178287. The next prime is 3721178347. The reversal of 3721178340 is 438711273.

3721178340 is a `hidden beast` number, since 37 + 211 + 78 + 340 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 3721178295 and 3721178304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721178347) 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, 36865 + ... + 93815.

It is an arithmetic number, because the mean of its divisors is an integer number (88370520).

Almost surely, 2^3721178340 is an apocalyptic number.

3721178340 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 3721178340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6362677440).

3721178340 is an abundant number, since it is smaller than the sum of its proper divisors (9004176540).

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

3721178340 is a wasteful number, since it uses less digits than its factorization.

3721178340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56991 (or 56972 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 3721178340 is about 61001.4617857638. The cubic root of 3721178340 is about 1549.6257632751.

The spelling of 3721178340 in words is "three billion, seven hundred twenty-one million, one hundred seventy-eight thousand, three hundred forty".