128137849 has 16 divisors (see below), whose sum is σ = 153256960. Its totient is φ = 104820480.

The previous prime is 128137831. The next prime is 128137859. The reversal of 128137849 is 948731821.

It is a cyclic number.

It is not a de Polignac number, because 128137849 - 2⁵ = 128137817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128137859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11797 + ... + 19885.

It is an arithmetic number, because the mean of its divisors is an integer number (9578560).

Almost surely, 2^128137849 is an apocalyptic number.

It is an amenable number.

128137849 is a deficient number, since it is larger than the sum of its proper divisors (25119111).

128137849 is an equidigital number, since it uses as much as digits as its factorization.

128137849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8200.

The product of its digits is 96768, while the sum is 43.

The square root of 128137849 is about 11319.7989823141. The cubic root of 128137849 is about 504.1492705273.

The spelling of 128137849 in words is "one hundred twenty-eight million, one hundred thirty-seven thousand, eight hundred forty-nine".