1620535 has 8 divisors (see below), whose sum is σ = 2222496. Its totient is φ = 1111200.

The previous prime is 1620523. The next prime is 1620539. The reversal of 1620535 is 5350261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1620535 - 2¹⁷ = 1489463 is a prime.

It is a super-2 number, since 2×1620535² = 5252267372450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620539) 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, 23116 + ... + 23185.

It is an arithmetic number, because the mean of its divisors is an integer number (277812).

2^1620535 is an apocalyptic number.

1620535 is a deficient number, since it is larger than the sum of its proper divisors (601961).

1620535 is an equidigital number, since it uses as much as digits as its factorization.

1620535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46313.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 1620535 is about 1273.0023566357. The cubic root of 1620535 is about 117.4589565417.

Adding to 1620535 its reverse (5350261), we get a palindrome (6970796).

The spelling of 1620535 in words is "one million, six hundred twenty thousand, five hundred thirty-five".