1971349728 has 24 divisors (see below), whose sum is σ = 5174793288. Its totient is φ = 657116544.

The previous prime is 1971349687. The next prime is 1971349729. The reversal of 1971349728 is 8279431791.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971349729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10267351 + ... + 10267542.

It is an arithmetic number, because the mean of its divisors is an integer number (215616387).

Almost surely, 2^1971349728 is an apocalyptic number.

It is an amenable number.

1971349728 is an abundant number, since it is smaller than the sum of its proper divisors (3203443560).

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

1971349728 is a wasteful number, since it uses less digits than its factorization.

1971349728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20534906 (or 20534898 counting only the distinct ones).

The product of its digits is 762048, while the sum is 51.

The square root of 1971349728 is about 44399.8843241736. The cubic root of 1971349728 is about 1253.8759114003.

The spelling of 1971349728 in words is "one billion, nine hundred seventy-one million, three hundred forty-nine thousand, seven hundred twenty-eight".