1620433 has 8 divisors (see below), whose sum is σ = 1702080. Its totient is φ = 1540560.

The previous prime is 1620431. The next prime is 1620439. The reversal of 1620433 is 3340261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620433 - 2¹ = 1620431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1620433.

It is not an unprimeable number, because it can be changed into a prime (1620431) 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, 1666 + ... + 2452.

It is an arithmetic number, because the mean of its divisors is an integer number (212760).

2^1620433 is an apocalyptic number.

It is an amenable number.

1620433 is a deficient number, since it is larger than the sum of its proper divisors (81647).

1620433 is an equidigital number, since it uses as much as digits as its factorization.

1620433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1620433 is about 1272.9622932357. The cubic root of 1620433 is about 117.4564921158.

Adding to 1620433 its reverse (3340261), we get a palindrome (4960694).

It can be divided in two parts, 16 and 20433, that added together give a square (20449 = 143²).

The spelling of 1620433 in words is "one million, six hundred twenty thousand, four hundred thirty-three".