1328431819 has 8 divisors (see below), whose sum is σ = 1560675312. Its totient is φ = 1114767840.

The previous prime is 1328431817. The next prime is 1328431837. The reversal of 1328431819 is 9181348231.

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 1328431819 - 2¹ = 1328431817 is a prime.

It is a super-2 number, since 2×1328431819² = 3529462195463297522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328431817) 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, 4644724 + ... + 4645009.

It is an arithmetic number, because the mean of its divisors is an integer number (195084414).

Almost surely, 2^1328431819 is an apocalyptic number.

1328431819 is a deficient number, since it is larger than the sum of its proper divisors (232243493).

1328431819 is a wasteful number, since it uses less digits than its factorization.

1328431819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9289757.

The product of its digits is 41472, while the sum is 40.

The square root of 1328431819 is about 36447.6586216454. The cubic root of 1328431819 is about 1099.2920565973.

The spelling of 1328431819 in words is "one billion, three hundred twenty-eight million, four hundred thirty-one thousand, eight hundred nineteen".