40009398 has 96 divisors (see below), whose sum is σ = 100559232. Its totient is φ = 10483200.

The previous prime is 40009391. The next prime is 40009429. The reversal of 40009398 is 89390004.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40009391) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 189513 + ... + 189723.

It is an arithmetic number, because the mean of its divisors is an integer number (1047492).

Almost surely, 2^40009398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40009398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50279616).

40009398 is an abundant number, since it is smaller than the sum of its proper divisors (60549834).

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

40009398 is a wasteful number, since it uses less digits than its factorization.

40009398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 40009398 is about 6325.2982538375. The cubic root of 40009398 is about 342.0219711612.

The spelling of 40009398 in words is "forty million, nine thousand, three hundred ninety-eight".