128105930 has 16 divisors (see below), whose sum is σ = 230792544. Its totient is φ = 51197520.

The previous prime is 128105909. The next prime is 128105947. The reversal of 128105930 is 39501821.

It is a super-2 number, since 2×128105930² = 32822258602329800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128105893 and 128105902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7949 + ... + 17871.

It is an arithmetic number, because the mean of its divisors is an integer number (14424534).

Almost surely, 2^128105930 is an apocalyptic number.

128105930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128105930 is a deficient number, since it is larger than the sum of its proper divisors (102686614).

128105930 is a wasteful number, since it uses less digits than its factorization.

128105930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11221.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 128105930 is about 11318.3890196441. The cubic root of 128105930 is about 504.1074060377.

The spelling of 128105930 in words is "one hundred twenty-eight million, one hundred five thousand, nine hundred thirty".