1957000643 has 32 divisors (see below), whose sum is σ = 2257016832. Its totient is φ = 1683820800.

The previous prime is 1957000637. The next prime is 1957000651. The reversal of 1957000643 is 3460007591.

It is a Cunningham number, because it is equal to 44238²-1.

It is not a de Polignac number, because 1957000643 - 2¹⁴ = 1956984259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1957000663) 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 31 ways as a sum of consecutive naturals, for example, 1370696 + ... + 1372122.

It is an arithmetic number, because the mean of its divisors is an integer number (70531776).

Almost surely, 2^1957000643 is an apocalyptic number.

1957000643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1957000643 is a deficient number, since it is larger than the sum of its proper divisors (300016189).

1957000643 is a wasteful number, since it uses less digits than its factorization.

1957000643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 1957000643 is about 44237.9999886975. Note that the first 4 decimals coincide. The cubic root of 1957000643 is about 1250.8262575584.

The spelling of 1957000643 in words is "one billion, nine hundred fifty-seven million, six hundred forty-three", and thus it is an aban number.