40998409 has 9 divisors (see below), whose sum is σ = 43398567. Its totient is φ = 38725344.

The previous prime is 40998403. The next prime is 40998421. The reversal of 40998409 is 90489904.

The square root of 40998409 is 6403.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11055625 + 29942784 = 3325^2 + 5472^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40998409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40998403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 121489 + ... + 121825.

It is an arithmetic number, because the mean of its divisors is an integer number (4822063).

Almost surely, 2^40998409 is an apocalyptic number.

40998409 is the 6403-rd square number.

40998409 is the 3202-nd centered octagonal number.

It is an amenable number.

40998409 is a deficient number, since it is larger than the sum of its proper divisors (2400158).

40998409 is an frugal number, since it uses more digits than its factorization.

40998409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The cubic root of 40998409 is about 344.8172637256.

The spelling of 40998409 in words is "forty million, nine hundred ninety-eight thousand, four hundred nine".