1974321720 has 384 divisors, whose sum is σ = 7637760000. Its totient is φ = 441987840.

The previous prime is 1974321691. The next prime is 1974321751. The reversal of 1974321720 is 271234791.

1974321720 is a `hidden beast` number, since 197 + 432 + 17 + 20 = 666.

1974321720 is digitally balanced in base 4, 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 an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7285185 + ... + 7285455.

It is an arithmetic number, because the mean of its divisors is an integer number (19890000).

Almost surely, 2^1974321720 is an apocalyptic number.

1974321720 is a gapful number since it is divisible by the number (10) 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 1974321720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3818880000).

1974321720 is an abundant number, since it is smaller than the sum of its proper divisors (5663438280).

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

1974321720 is a wasteful number, since it uses less digits than its factorization.

1974321720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 1974321720 is about 44433.3401850457. The cubic root of 1974321720 is about 1254.5057063078.

The spelling of 1974321720 in words is "one billion, nine hundred seventy-four million, three hundred twenty-one thousand, seven hundred twenty".