1617880399 has 4 divisors (see below), whose sum is σ = 1617973720. Its totient is φ = 1617787080.

The previous prime is 1617880379. The next prime is 1617880403. The reversal of 1617880399 is 9930887161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1617880399 - 2⁵ = 1617880367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1617880379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12144 + ... + 58165.

It is an arithmetic number, because the mean of its divisors is an integer number (404493430).

Almost surely, 2^1617880399 is an apocalyptic number.

1617880399 is a deficient number, since it is larger than the sum of its proper divisors (93321).

1617880399 is an equidigital number, since it uses as much as digits as its factorization.

1617880399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93320.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 1617880399 is about 40222.8840214125. The cubic root of 1617880399 is about 1173.9478492023.

The spelling of 1617880399 in words is "one billion, six hundred seventeen million, eight hundred eighty thousand, three hundred ninety-nine".