1957866840 has 96 divisors (see below), whose sum is σ = 6535086480. Its totient is φ = 507983616.

The previous prime is 1957866817. The next prime is 1957866851. The reversal of 1957866840 is 486687591.

1957866840 is a `hidden beast` number, since 1 + 9 + 578 + 6 + 68 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60174 + ... + 86813.

Almost surely, 2^1957866840 is an apocalyptic number.

1957866840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1957866840 is an abundant number, since it is smaller than the sum of its proper divisors (4577219640).

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

1957866840 is a wasteful number, since it uses less digits than its factorization.

1957866840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147041 (or 147034 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 1957866840 is about 44247.7890973097. The cubic root of 1957866840 is about 1251.0107749802.

The spelling of 1957866840 in words is "one billion, nine hundred fifty-seven million, eight hundred sixty-six thousand, eight hundred forty".