1621080 has 128 divisors (see below), whose sum is σ = 5760000. Its totient is φ = 404352.

The previous prime is 1621079. The next prime is 1621093. The reversal of 1621080 is 801261.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20481 + ... + 20559.

It is an arithmetic number, because the mean of its divisors is an integer number (45000).

2^1621080 is an apocalyptic number.

1621080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2880000).

1621080 is an abundant number, since it is smaller than the sum of its proper divisors (4138920).

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

1621080 is a wasteful number, since it uses less digits than its factorization.

1621080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1621080 is about 1273.2163995174. The cubic root of 1621080 is about 117.4721225550.

It can be divided in two parts, 16210 and 80, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 1621080 in words is "one million, six hundred twenty-one thousand, eighty".