1686420145 has 64 divisors (see below), whose sum is σ = 2386298880. Its totient is φ = 1134701568.

The previous prime is 1686420121. The next prime is 1686420157. The reversal of 1686420145 is 5410246861.

It is a cyclic number.

It is not a de Polignac number, because 1686420145 - 2¹³ = 1686411953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3082762 + ... + 3083308.

It is an arithmetic number, because the mean of its divisors is an integer number (37285920).

Almost surely, 2^1686420145 is an apocalyptic number.

It is an amenable number.

1686420145 is a deficient number, since it is larger than the sum of its proper divisors (699878735).

1686420145 is a wasteful number, since it uses less digits than its factorization.

1686420145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1686420145 is about 41066.0461330282. The cubic root of 1686420145 is about 1190.2967847196.

The spelling of 1686420145 in words is "one billion, six hundred eighty-six million, four hundred twenty thousand, one hundred forty-five".