1957143 has 4 divisors (see below), whose sum is σ = 2609528. Its totient is φ = 1304760.

The previous prime is 1957129. The next prime is 1957147. The reversal of 1957143 is 3417591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3417591 = 3 ⋅1139197.

It is not a de Polignac number, because 1957143 - 2⁶ = 1957079 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1957143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1957147) 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, 326188 + ... + 326193.

It is an arithmetic number, because the mean of its divisors is an integer number (652382).

2^1957143 is an apocalyptic number.

1957143 is a deficient number, since it is larger than the sum of its proper divisors (652385).

1957143 is an equidigital number, since it uses as much as digits as its factorization.

1957143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652384.

The product of its digits is 3780, while the sum is 30.

The square root of 1957143 is about 1398.9792707542. The cubic root of 1957143 is about 125.0856586207.

The spelling of 1957143 in words is "one million, nine hundred fifty-seven thousand, one hundred forty-three".