1667620 has 24 divisors (see below), whose sum is σ = 3528000. Its totient is φ = 662112.

The previous prime is 1667609. The next prime is 1667623. The reversal of 1667620 is 267661.

It is not an unprimeable number, because it can be changed into a prime (1667623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3771 + ... + 4189.

It is an arithmetic number, because the mean of its divisors is an integer number (147000).

2^1667620 is an apocalyptic number.

1667620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1667620 is an abundant number, since it is smaller than the sum of its proper divisors (1860380).

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

1667620 is a wasteful number, since it uses less digits than its factorization.

1667620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1667620 is about 1291.3636203641. The cubic root of 1667620 is about 118.5857118738.

The spelling of 1667620 in words is "one million, six hundred sixty-seven thousand, six hundred twenty".