128373986 has 8 divisors (see below), whose sum is σ = 207373404. Its totient is φ = 59249520.

The previous prime is 128373961. The next prime is 128373991. The reversal of 128373986 is 689373821.

It can be written as a sum of positive squares in 2 ways, for example, as 127260961 + 1113025 = 11281^2 + 1055^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 128373986.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2468705 + ... + 2468756.

Almost surely, 2^128373986 is an apocalyptic number.

128373986 is a deficient number, since it is larger than the sum of its proper divisors (78999418).

128373986 is a wasteful number, since it uses less digits than its factorization.

128373986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4937476.

The product of its digits is 435456, while the sum is 47.

The square root of 128373986 is about 11330.2244461440. The cubic root of 128373986 is about 504.4587685748.

The spelling of 128373986 in words is "one hundred twenty-eight million, three hundred seventy-three thousand, nine hundred eighty-six".