1986057 has 6 divisors (see below), whose sum is σ = 2868762. Its totient is φ = 1324032.

The previous prime is 1986053. The next prime is 1986067. The reversal of 1986057 is 7506891.

It can be written as a sum of positive squares in only one way, i.e., 1320201 + 665856 = 1149^2 + 816^2 .

It is not a de Polignac number, because 1986057 - 2² = 1986053 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1986053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110328 + ... + 110345.

It is an arithmetic number, because the mean of its divisors is an integer number (478127).

2^1986057 is an apocalyptic number.

It is an amenable number.

1986057 is a deficient number, since it is larger than the sum of its proper divisors (882705).

1986057 is a wasteful number, since it uses less digits than its factorization.

1986057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220679 (or 220676 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1986057 is about 1409.2753457008. The cubic root of 1986057 is about 125.6986373060.

The spelling of 1986057 in words is "one million, nine hundred eighty-six thousand, fifty-seven".