40395402891 has 16 divisors (see below), whose sum is σ = 59885454720. Its totient is φ = 26912082600.

The previous prime is 40395402871. The next prime is 40395402911. The reversal of 40395402891 is 19820459304.

It is an interprime number because it is at equal distance from previous prime (40395402871) and next prime (40395402911).

It is not a de Polignac number, because 40395402891 - 2¹⁵ = 40395370123 is a prime.

It is a super-2 number, since 2×40395402891² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40395402811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464385 + ... + 544466.

It is an arithmetic number, because the mean of its divisors is an integer number (3742840920).

Almost surely, 2^40395402891 is an apocalyptic number.

40395402891 is a deficient number, since it is larger than the sum of its proper divisors (19490051829).

40395402891 is a wasteful number, since it uses less digits than its factorization.

40395402891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010343 (or 1010337 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 40395402891 in words is "forty billion, three hundred ninety-five million, four hundred two thousand, eight hundred ninety-one".