128465229 has 4 divisors (see below), whose sum is σ = 171286976. Its totient is φ = 85643484.

The previous prime is 128465219. The next prime is 128465231. The reversal of 128465229 is 922564821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 128465229 - 2⁷ = 128465101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128465219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21410869 + ... + 21410874.

It is an arithmetic number, because the mean of its divisors is an integer number (42821744).

Almost surely, 2^128465229 is an apocalyptic number.

It is an amenable number.

128465229 is a deficient number, since it is larger than the sum of its proper divisors (42821747).

128465229 is an equidigital number, since it uses as much as digits as its factorization.

128465229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42821746.

The product of its digits is 69120, while the sum is 39.

The square root of 128465229 is about 11334.2502619273. The cubic root of 128465229 is about 504.5782565182.

The spelling of 128465229 in words is "one hundred twenty-eight million, four hundred sixty-five thousand, two hundred twenty-nine".