1623620 has 12 divisors (see below), whose sum is σ = 3409644. Its totient is φ = 649440.

The previous prime is 1623599. The next prime is 1623631. The reversal of 1623620 is 263261.

It can be written as a sum of positive squares in 2 ways, for example, as 806404 + 817216 = 898^2 + 904^2 .

It is a super-2 number, since 2×1623620² = 5272283808800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 81181 = 1623620 / (1 + 6 + 2 + 3 + 6 + 2 + 0).

It is a nialpdrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 1623592 and 1623601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40571 + ... + 40610.

It is an arithmetic number, because the mean of its divisors is an integer number (284137).

2^1623620 is an apocalyptic number.

1623620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1623620 is an abundant number, since it is smaller than the sum of its proper divisors (1786024).

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

1623620 is a wasteful number, since it uses less digits than its factorization.

1623620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81190 (or 81188 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1623620 is about 1274.2134828984. The cubic root of 1623620 is about 117.5334445312.

Adding to 1623620 its reverse (263261), we get a palindrome (1886881).

The spelling of 1623620 in words is "one million, six hundred twenty-three thousand, six hundred twenty".