128333949 has 4 divisors (see below), whose sum is σ = 171111936. Its totient is φ = 85555964.

The previous prime is 128333941. The next prime is 128333957. The reversal of 128333949 is 949333821.

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 an interprime number because it is at equal distance from previous prime (128333941) and next prime (128333957).

It is a cyclic number.

It is not a de Polignac number, because 128333949 - 2³ = 128333941 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128333949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128333941) 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, 21388989 + ... + 21388994.

It is an arithmetic number, because the mean of its divisors is an integer number (42777984).

Almost surely, 2^128333949 is an apocalyptic number.

It is an amenable number.

128333949 is a deficient number, since it is larger than the sum of its proper divisors (42777987).

128333949 is an equidigital number, since it uses as much as digits as its factorization.

128333949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42777986.

The product of its digits is 139968, while the sum is 42.

The square root of 128333949 is about 11328.4574854655. The cubic root of 128333949 is about 504.4063199535.

The spelling of 128333949 in words is "one hundred twenty-eight million, three hundred thirty-three thousand, nine hundred forty-nine".