40491699840 has 96 divisors (see below), whose sum is σ = 139822920900. Its totient is φ = 10797785088.

The previous prime is 40491699839. The next prime is 40491699841. The reversal of 40491699840 is 4899619404.

It is a happy number.

40491699840 is a `hidden beast` number, since 4 + 0 + 491 + 69 + 98 + 4 + 0 = 666.

40491699840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40491699839) and next prime (40491699841).

It can be written as a sum of positive squares in 2 ways, for example, as 40131307584 + 360392256 = 200328^2 + 18984^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (40491699841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3509145 + ... + 3520664.

Almost surely, 2^40491699840 is an apocalyptic number.

40491699840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40491699840 is an abundant number, since it is smaller than the sum of its proper divisors (99331221060).

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

40491699840 is a wasteful number, since it uses less digits than its factorization.

40491699840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7029834 (or 7029819 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 40491699840 in words is "forty billion, four hundred ninety-one million, six hundred ninety-nine thousand, eight hundred forty".