1601620 has 24 divisors (see below), whose sum is σ = 3412584. Its totient is φ = 631296.

The previous prime is 1601617. The next prime is 1601623. The reversal of 1601620 is 261061.

1601620 = T₆₉ + T₇₀ + ... + T₂₁₄.

It is an interprime number because it is at equal distance from previous prime (1601617) and next prime (1601623).

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 1507984 = 306^2 + 1228^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1601594 and 1601603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 912 + ... + 2008.

It is an arithmetic number, because the mean of its divisors is an integer number (142191).

2^1601620 is an apocalyptic number.

1601620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601620 is an abundant number, since it is smaller than the sum of its proper divisors (1810964).

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

1601620 is a wasteful number, since it uses less digits than its factorization.

1601620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 1177 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1601620 is about 1265.5512632841. The cubic root of 1601620 is about 117.0001704529. Note that the first 3 decimals are identical.

Adding to 1601620 its reverse (261061), we get a palindrome (1862681).

The spelling of 1601620 in words is "one million, six hundred one thousand, six hundred twenty".