1957985 has 8 divisors (see below), whose sum is σ = 2362920. Its totient is φ = 1557504.

The previous prime is 1957981. The next prime is 1957997. The reversal of 1957985 is 5897591.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 508369 + 1449616 = 713^2 + 1204^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1957985 - 2² = 1957981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1957981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50 + ... + 1979.

It is an arithmetic number, because the mean of its divisors is an integer number (295365).

2^1957985 is an apocalyptic number.

It is an amenable number.

1957985 is a deficient number, since it is larger than the sum of its proper divisors (404935).

1957985 is a wasteful number, since it uses less digits than its factorization.

1957985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227.

The product of its digits is 113400, while the sum is 44.

The square root of 1957985 is about 1399.2801720885. The cubic root of 1957985 is about 125.1035941223.

The spelling of 1957985 in words is "one million, nine hundred fifty-seven thousand, nine hundred eighty-five".