1957843540 has 12 divisors (see below), whose sum is σ = 4111471476. Its totient is φ = 783137408.

The previous prime is 1957843523. The next prime is 1957843553. The reversal of 1957843540 is 453487591.

It can be written as a sum of positive squares in 2 ways, for example, as 1515077776 + 442765764 = 38924^2 + 21042^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48946069 + ... + 48946108.

It is an arithmetic number, because the mean of its divisors is an integer number (342622623).

Almost surely, 2^1957843540 is an apocalyptic number.

1957843540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1957843540 is an abundant number, since it is smaller than the sum of its proper divisors (2153627936).

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

1957843540 is a wasteful number, since it uses less digits than its factorization.

1957843540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97892186 (or 97892184 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 1957843540 is about 44247.5258065352. The cubic root of 1957843540 is about 1251.0058123228.

The spelling of 1957843540 in words is "one billion, nine hundred fifty-seven million, eight hundred forty-three thousand, five hundred forty".