128249207 has 8 divisors (see below), whose sum is σ = 135957600. Its totient is φ = 120559104.

The previous prime is 128249197. The next prime is 128249227. The reversal of 128249207 is 702942821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128249207 - 2⁸ = 128248951 is a prime.

It is a super-2 number, since 2×128249207² = 32895718192257698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128249227) 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, 11519 + ... + 19727.

It is an arithmetic number, because the mean of its divisors is an integer number (16994700).

Almost surely, 2^128249207 is an apocalyptic number.

128249207 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

128249207 is a deficient number, since it is larger than the sum of its proper divisors (7708393).

128249207 is an equidigital number, since it uses as much as digits as its factorization.

128249207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9145.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 128249207 is about 11324.7166410467. The cubic root of 128249207 is about 504.2952716234.

The spelling of 128249207 in words is "one hundred twenty-eight million, two hundred forty-nine thousand, two hundred seven".