40400399989 has 16 divisors (see below), whose sum is σ = 44280976320. Its totient is φ = 36688664320.

The previous prime is 40400399987. The next prime is 40400400043. The reversal of 40400399989 is 98999300404.

It is a cyclic number.

It is not a de Polignac number, because 40400399989 - 2¹ = 40400399987 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 (40400399983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 748422 + ... + 800584.

It is an arithmetic number, because the mean of its divisors is an integer number (2767561020).

Almost surely, 2^40400399989 is an apocalyptic number.

It is an amenable number.

40400399989 is a deficient number, since it is larger than the sum of its proper divisors (3880576331).

40400399989 is a wasteful number, since it uses less digits than its factorization.

40400399989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53780.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The spelling of 40400399989 in words is "forty billion, four hundred million, three hundred ninety-nine thousand, nine hundred eighty-nine".