1620838463 has 4 divisors (see below), whose sum is σ = 1716181920. Its totient is φ = 1525495008.

The previous prime is 1620838447. The next prime is 1620838469. The reversal of 1620838463 is 3648380261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1620838463 - 2⁴ = 1620838447 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 1620838463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620838469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47671703 + ... + 47671736.

It is an arithmetic number, because the mean of its divisors is an integer number (429045480).

Almost surely, 2^1620838463 is an apocalyptic number.

1620838463 is a deficient number, since it is larger than the sum of its proper divisors (95343457).

1620838463 is an equidigital number, since it uses as much as digits as its factorization.

1620838463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95343456.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 1620838463 is about 40259.6381379664. The cubic root of 1620838463 is about 1174.6628791116.

The spelling of 1620838463 in words is "one billion, six hundred twenty million, eight hundred thirty-eight thousand, four hundred sixty-three".