1620685 has 16 divisors (see below), whose sum is σ = 2154240. Its totient is φ = 1160640.

The previous prime is 1620679. The next prime is 1620733. The reversal of 1620685 is 5860261.

It is not a de Polignac number, because 1620685 - 2³ = 1620677 is a prime.

1620685 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4159 + ... + 4531.

It is an arithmetic number, because the mean of its divisors is an integer number (134640).

2^1620685 is an apocalyptic number.

It is an amenable number.

1620685 is a deficient number, since it is larger than the sum of its proper divisors (533555).

1620685 is a wasteful number, since it uses less digits than its factorization.

1620685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1620685 is about 1273.0612711099. The cubic root of 1620685 is about 117.4625805094.

The spelling of 1620685 in words is "one million, six hundred twenty thousand, six hundred eighty-five".