1680455 has 24 divisors (see below), whose sum is σ = 2476080. Its totient is φ = 1091664.

The previous prime is 1680439. The next prime is 1680457. The reversal of 1680455 is 5540861.

It is a happy number.

It is not a de Polignac number, because 1680455 - 2⁴ = 1680439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88436 + ... + 88454.

It is an arithmetic number, because the mean of its divisors is an integer number (103170).

2^1680455 is an apocalyptic number.

1680455 is a deficient number, since it is larger than the sum of its proper divisors (795625).

1680455 is an frugal number, since it uses more digits than its factorization.

1680455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1680455 is about 1296.3236478596. The cubic root of 1680455 is about 118.8891701678.

The spelling of 1680455 in words is "one million, six hundred eighty thousand, four hundred fifty-five".