1986957 has 16 divisors (see below), whose sum is σ = 3364480. Its totient is φ = 1135296.

The previous prime is 1986949. The next prime is 1986967. The reversal of 1986957 is 7596891.

It is not a de Polignac number, because 1986957 - 2³ = 1986949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5068 + ... + 5445.

It is an arithmetic number, because the mean of its divisors is an integer number (210280).

2^1986957 is an apocalyptic number.

It is an amenable number.

1986957 is a deficient number, since it is larger than the sum of its proper divisors (1377523).

1986957 is a wasteful number, since it uses less digits than its factorization.

1986957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10529 (or 10523 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 1986957 is about 1409.5946225777. The cubic root of 1986957 is about 125.7176216032.

The spelling of 1986957 in words is "one million, nine hundred eighty-six thousand, nine hundred fifty-seven".