1620660 has 24 divisors (see below), whose sum is σ = 4538016. Its totient is φ = 432160.

The previous prime is 1620631. The next prime is 1620667. The reversal of 1620660 is 660261.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13446 + ... + 13565.

It is an arithmetic number, because the mean of its divisors is an integer number (189084).

2^1620660 is an apocalyptic number.

1620660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620660 is an abundant number, since it is smaller than the sum of its proper divisors (2917356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620660 is a wasteful number, since it uses less digits than its factorization.

1620660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27023 (or 27021 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1620660 is about 1273.0514522202. The cubic root of 1620660 is about 117.4619765303.

The spelling of 1620660 in words is "one million, six hundred twenty thousand, six hundred sixty".