40128498 has 48 divisors (see below), whose sum is σ = 90431640. Its totient is φ = 12849408.

The previous prime is 40128493. The next prime is 40128499. The reversal of 40128498 is 89482104.

40128498 is a `hidden beast` number, since 40 + 128 + 498 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 40106889 + 21609 = 6333^2 + 147^2 .

It is a super-2 number, since 2×40128498² = 3220592703472008, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128493) 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, 58936 + ... + 59612.

Almost surely, 2^40128498 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40128498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45215820).

40128498 is an abundant number, since it is smaller than the sum of its proper divisors (50303142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40128498 is a wasteful number, since it uses less digits than its factorization.

40128498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 40128498 is about 6334.7058337385. The cubic root of 40128498 is about 342.3610120342.

The spelling of 40128498 in words is "forty million, one hundred twenty-eight thousand, four hundred ninety-eight".