1974188640 has 192 divisors, whose sum is σ = 6376720896. Its totient is φ = 513257472.

The previous prime is 1974188633. The next prime is 1974188651. The reversal of 1974188640 is 468814791.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1974188640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3608847 + ... + 3609393.

It is an arithmetic number, because the mean of its divisors is an integer number (33212088).

Almost surely, 2^1974188640 is an apocalyptic number.

1974188640 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 1974188640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3188360448).

1974188640 is an abundant number, since it is smaller than the sum of its proper divisors (4402532256).

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

1974188640 is a wasteful number, since it uses less digits than its factorization.

1974188640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 1974188640 is about 44431.8426356594. The cubic root of 1974188640 is about 1254.4775188432.

The spelling of 1974188640 in words is "one billion, nine hundred seventy-four million, one hundred eighty-eight thousand, six hundred forty".