1971421460 has 12 divisors (see below), whose sum is σ = 4139985108. Its totient is φ = 788568576.

The previous prime is 1971421453. The next prime is 1971421483. The reversal of 1971421460 is 641241791.

It can be written as a sum of positive squares in 2 ways, for example, as 519201796 + 1452219664 = 22786^2 + 38108^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1971421460.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49285517 + ... + 49285556.

It is an arithmetic number, because the mean of its divisors is an integer number (344998759).

Almost surely, 2^1971421460 is an apocalyptic number.

1971421460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1971421460 is an abundant number, since it is smaller than the sum of its proper divisors (2168563648).

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

1971421460 is a wasteful number, since it uses less digits than its factorization.

1971421460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98571082 (or 98571080 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1971421460 is about 44400.6921117228. The cubic root of 1971421460 is about 1253.8911195822.

The spelling of 1971421460 in words is "one billion, nine hundred seventy-one million, four hundred twenty-one thousand, four hundred sixty".