40840389 has 8 divisors (see below), whose sum is σ = 60504320. Its totient is φ = 27226908.

The previous prime is 40840379. The next prime is 40840403. The reversal of 40840389 is 98304804.

It is not a de Polignac number, because 40840389 - 2⁵ = 40840357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40840309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756277 + ... + 756330.

It is an arithmetic number, because the mean of its divisors is an integer number (7563040).

Almost surely, 2^40840389 is an apocalyptic number.

It is an amenable number.

40840389 is a deficient number, since it is larger than the sum of its proper divisors (19663931).

40840389 is a wasteful number, since it uses less digits than its factorization.

40840389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512616 (or 1512610 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 40840389 is about 6390.6485586363. The cubic root of 40840389 is about 344.3736840847.

The spelling of 40840389 in words is "forty million, eight hundred forty thousand, three hundred eighty-nine".