1621116 has 54 divisors (see below), whose sum is σ = 4772040. Its totient is φ = 462672.

The previous prime is 1621097. The next prime is 1621127. The reversal of 1621116 is 6111261.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1305 + ... + 2223.

2^1621116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2386020).

1621116 is an abundant number, since it is smaller than the sum of its proper divisors (3150924).

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

1621116 is a wasteful number, since it uses less digits than its factorization.

1621116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943 (or 931 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1621116 is about 1273.2305368628. The cubic root of 1621116 is about 117.4729921327.

Adding to 1621116 its reverse (6111261), we get a palindrome (7732377).

The spelling of 1621116 in words is "one million, six hundred twenty-one thousand, one hundred sixteen".