128398412015 has 4 divisors (see below), whose sum is σ = 154078094424. Its totient is φ = 102718729608.

The previous prime is 128398411979. The next prime is 128398412027. The reversal of 128398412015 is 510214893821.

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 128398412015 - 2²² = 128394217711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12839841197 + ... + 12839841206.

It is an arithmetic number, because the mean of its divisors is an integer number (38519523606).

Almost surely, 2^128398412015 is an apocalyptic number.

128398412015 is a deficient number, since it is larger than the sum of its proper divisors (25679682409).

128398412015 is an equidigital number, since it uses as much as digits as its factorization.

128398412015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25679682408.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 128398412015 in words is "one hundred twenty-eight billion, three hundred ninety-eight million, four hundred twelve thousand, fifteen".