128446019 has 4 divisors (see below), whose sum is σ = 138326496. Its totient is φ = 118565544.

The previous prime is 128446013. The next prime is 128446027. The reversal of 128446019 is 910644821.

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 128446019 - 2¹² = 128441923 is a prime.

It is a super-2 number, since 2×128446019² = 32996759593896722, which contains 22 as substring.

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 128446019.

It is not an unprimeable number, because it can be changed into a prime (128446013) 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, 4940219 + ... + 4940244.

It is an arithmetic number, because the mean of its divisors is an integer number (34581624).

Almost surely, 2^128446019 is an apocalyptic number.

128446019 is a deficient number, since it is larger than the sum of its proper divisors (9880477).

128446019 is an equidigital number, since it uses as much as digits as its factorization.

128446019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9880476.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 128446019 is about 11333.4027988067. The cubic root of 128446019 is about 504.5531046241.

The spelling of 128446019 in words is "one hundred twenty-eight million, four hundred forty-six thousand, nineteen".