40128658 has 8 divisors (see below), whose sum is σ = 60452028. Its totient is φ = 19977984.

The previous prime is 40128643. The next prime is 40128659. The reversal of 40128658 is 85682104.

It can be written as a sum of positive squares in 2 ways, for example, as 29192409 + 10936249 = 5403^2 + 3307^2 .

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

It is a super-2 number, since 2×40128658² = 3220618385761928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40128659) 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, 42591 + ... + 43522.

Almost surely, 2^40128658 is an apocalyptic number.

40128658 is a deficient number, since it is larger than the sum of its proper divisors (20323370).

40128658 is a wasteful number, since it uses less digits than its factorization.

40128658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86348.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 40128658 is about 6334.7184625680. The cubic root of 40128658 is about 342.3614670532.

The spelling of 40128658 in words is "forty million, one hundred twenty-eight thousand, six hundred fifty-eight".