1620516 has 12 divisors (see below), whose sum is σ = 3781232.
Its totient is φ = 540168.
The previous prime is 1620497. The next prime is 1620517. The reversal of 1620516 is 6150261.
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (12).
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 nialpdrome in base 6.
It is a junction number, because it is equal to n+sod(n) for n = 1620492 and 1620501.
It is not an unprimeable number, because it can be changed into a prime (1620517) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67510 + ... + 67533.
21620516 is an apocalyptic number.
It is an amenable number.
1620516 is an abundant number, since it is smaller than the sum of its proper divisors (2160716).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1620516 is a wasteful number, since it uses less digits than its factorization.
1620516 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 135050 (or 135048 counting only the distinct ones).
The product of its (nonzero) digits is 360, while the sum is 21.
The square root of 1620516 is about 1272.9948939411.
The cubic root of 1620516 is about 117.4584974898.
Adding to 1620516 its reverse (6150261), we get a palindrome (7770777).
The spelling of 1620516 in words is "one million, six hundred twenty thousand, five hundred sixteen".