40840840 has 32 divisors (see below), whose sum is σ = 92415960. Its totient is φ = 16243200.

The previous prime is 40840837. The next prime is 40840843. The reversal of 40840840 is 4804804.

It is a happy number.

40840840 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 (40840837) and next prime (40840843).

It can be written as a sum of positive squares in 4 ways, for example, as 32649796 + 8191044 = 5714^2 + 2862^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40840799 and 40840808.

It is not an unprimeable number, because it can be changed into a prime (40840843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4420 + ... + 10060.

Almost surely, 2^40840840 is an apocalyptic number.

40840840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40840840 is an abundant number, since it is smaller than the sum of its proper divisors (51575120).

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

40840840 is a wasteful number, since it uses less digits than its factorization.

40840840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5833 (or 5829 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 40840840 is about 6390.6838444724. The cubic root of 40840840 is about 344.3749517184.

The spelling of 40840840 in words is "forty million, eight hundred forty thousand, eight hundred forty".