1986545 has 16 divisors (see below), whose sum is σ = 2738880. Its totient is φ = 1368000.

The previous prime is 1986541. The next prime is 1986547. The reversal of 1986545 is 5456891.

It is not a de Polignac number, because 1986545 - 2² = 1986541 is a prime.

It is a super-2 number, since 2×1986545² = 7892722074050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1986499 and 1986508.

It is not an unprimeable number, because it can be changed into a prime (1986541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95 + ... + 1995.

It is an arithmetic number, because the mean of its divisors is an integer number (171180).

2^1986545 is an apocalyptic number.

It is an amenable number.

1986545 is a deficient number, since it is larger than the sum of its proper divisors (752335).

1986545 is a wasteful number, since it uses less digits than its factorization.

1986545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936.

The product of its digits is 43200, while the sum is 38.

The square root of 1986545 is about 1409.4484736946. The cubic root of 1986545 is about 125.7089317254.

The spelling of 1986545 in words is "one million, nine hundred eighty-six thousand, five hundred forty-five".