128890949 has 16 divisors (see below), whose sum is σ = 144184320. Its totient is φ = 114232560.

The previous prime is 128890913. The next prime is 128890961. The reversal of 128890949 is 949098821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128890949 - 2¹² = 128886853 is a prime.

It is a super-2 number, since 2×128890949² = 33225753468241202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128890897 and 128890906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128896949) 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, 71234 + ... + 73020.

It is an arithmetic number, because the mean of its divisors is an integer number (9011520).

Almost surely, 2^128890949 is an apocalyptic number.

It is an amenable number.

128890949 is a deficient number, since it is larger than the sum of its proper divisors (15293371).

128890949 is a wasteful number, since it uses less digits than its factorization.

128890949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 128890949 is about 11353.0149740058. The cubic root of 128890949 is about 505.1350147118.

The spelling of 128890949 in words is "one hundred twenty-eight million, eight hundred ninety thousand, nine hundred forty-nine".