1686145 has 16 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 1249024.

The previous prime is 1686143. The next prime is 1686149. The reversal of 1686145 is 5416861.

It is not a de Polignac number, because 1686145 - 2¹ = 1686143 is a prime.

It is a super-2 number, since 2×1686145² = 5686169922050, which contains 22 as substring.

1686145 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1686143) 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, 6936 + ... + 7174.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

2^1686145 is an apocalyptic number.

It is an amenable number.

1686145 is a deficient number, since it is larger than the sum of its proper divisors (491135).

1686145 is a wasteful number, since it uses less digits than its factorization.

1686145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344.

The product of its digits is 5760, while the sum is 31.

The square root of 1686145 is about 1298.5164611972. The cubic root of 1686145 is about 119.0232047585.

The spelling of 1686145 in words is "one million, six hundred eighty-six thousand, one hundred forty-five".