1616820 has 24 divisors (see below), whose sum is σ = 4527264. Its totient is φ = 431136.

The previous prime is 1616809. The next prime is 1616821. The reversal of 1616820 is 286161.

It is a super-2 number, since 2×1616820² = 5228213824800, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13414 + ... + 13533.

It is an arithmetic number, because the mean of its divisors is an integer number (188636).

2^1616820 is an apocalyptic number.

1616820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1616820 is an abundant number, since it is smaller than the sum of its proper divisors (2910444).

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

1616820 is a wasteful number, since it uses less digits than its factorization.

1616820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26959 (or 26957 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1616820 is about 1271.5423705091. The cubic root of 1616820 is about 117.3691314954.

It can be divided in two parts, 16 and 16820, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 1616820 in words is "one million, six hundred sixteen thousand, eight hundred twenty".