1971247376 has 80 divisors (see below), whose sum is σ = 4637917440. Its totient is φ = 792330240.

The previous prime is 1971247373. The next prime is 1971247387. The reversal of 1971247376 is 6737421791.

It is a self number, because there is not a number n which added to its sum of digits gives 1971247376.

It is not an unprimeable number, because it can be changed into a prime (1971247373) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 590480 + ... + 593808.

It is an arithmetic number, because the mean of its divisors is an integer number (57973968).

Almost surely, 2^1971247376 is an apocalyptic number.

1971247376 is a gapful number since it is divisible by the number (16) 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 1971247376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2318958720).

1971247376 is an abundant number, since it is smaller than the sum of its proper divisors (2666670064).

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

1971247376 is a wasteful number, since it uses less digits than its factorization.

1971247376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3672 (or 3666 counting only the distinct ones).

The product of its digits is 444528, while the sum is 47.

The square root of 1971247376 is about 44398.7316935968. The cubic root of 1971247376 is about 1253.8542107136.

The spelling of 1971247376 in words is "one billion, nine hundred seventy-one million, two hundred forty-seven thousand, three hundred seventy-six".