1621296 has 70 divisors (see below), whose sum is σ = 4743620. Its totient is φ = 536544.

The previous prime is 1621283. The next prime is 1621309. The reversal of 1621296 is 6921261.

It is an interprime number because it is at equal distance from previous prime (1621283) and next prime (1621309).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

Its product of digits (1296) is a multiple of the sum of its prime divisors (144).

It is a nialpdrome in base 6.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 11595 + ... + 11733.

It is an arithmetic number, because the mean of its divisors is an integer number (67766).

2^1621296 is an apocalyptic number.

1621296 is a gapful number since it is divisible by the number (16) 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 1621296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2371810).

1621296 is an abundant number, since it is smaller than the sum of its proper divisors (3122324).

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

1621296 is an equidigital number, since it uses as much as digits as its factorization.

1621296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 144 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1621296 is about 1273.3012212356. The cubic root of 1621296 is about 117.4773398282.

It can be divided in two parts, 16 and 21296, that added together give a palindrome (21312).

The spelling of 1621296 in words is "one million, six hundred twenty-one thousand, two hundred ninety-six".