1971357456 has 40 divisors (see below), whose sum is σ = 5256957184. Its totient is φ = 635921280.

The previous prime is 1971357431. The next prime is 1971357457. The reversal of 1971357456 is 6547531791.

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

It is not an unprimeable number, because it can be changed into a prime (1971357457) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 660931 + ... + 663906.

Almost surely, 2^1971357456 is an apocalyptic number.

1971357456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1971357456 is an abundant number, since it is smaller than the sum of its proper divisors (3285599728).

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

1971357456 is a wasteful number, since it uses less digits than its factorization.

1971357456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324879 (or 1324873 counting only the distinct ones).

The product of its digits is 793800, while the sum is 48.

The square root of 1971357456 is about 44399.9713513421. The cubic root of 1971357456 is about 1253.8775498616.

The spelling of 1971357456 in words is "one billion, nine hundred seventy-one million, three hundred fifty-seven thousand, four hundred fifty-six".