1985957 has 8 divisors (see below), whose sum is σ = 2117016. Its totient is φ = 1856512.

The previous prime is 1985939. The next prime is 1985987. The reversal of 1985957 is 7595891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1256641 + 729316 = 1121^2 + 854^2 .

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 1985957 - 2¹⁴ = 1969573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985987) 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, 3053 + ... + 3645.

It is an arithmetic number, because the mean of its divisors is an integer number (264627).

2^1985957 is an apocalyptic number.

1985957 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1985957 is a deficient number, since it is larger than the sum of its proper divisors (131059).

1985957 is a wasteful number, since it uses less digits than its factorization.

1985957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807.

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

The square root of 1985957 is about 1409.2398660271. The cubic root of 1985957 is about 125.6965275856.

The spelling of 1985957 in words is "one million, nine hundred eighty-five thousand, nine hundred fifty-seven".