128440949 has 24 divisors (see below), whose sum is σ = 162626688. Its totient is φ = 98781120.

The previous prime is 128440937. The next prime is 128440951. The reversal of 128440949 is 949044821.

It is not a de Polignac number, because 128440949 - 2⁸ = 128440693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128440919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124064 + ... + 125094.

It is an arithmetic number, because the mean of its divisors is an integer number (6776112).

Almost surely, 2^128440949 is an apocalyptic number.

It is an amenable number.

128440949 is a deficient number, since it is larger than the sum of its proper divisors (34185739).

128440949 is a wasteful number, since it uses less digits than its factorization.

128440949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 128440949 is about 11333.1791214998. The cubic root of 128440949 is about 504.5464659912.

The spelling of 128440949 in words is "one hundred twenty-eight million, four hundred forty thousand, nine hundred forty-nine".