400034320040 has 32 divisors (see below), whose sum is σ = 904007709000. Its totient is φ = 159314974464.

The previous prime is 400034320001. The next prime is 400034320061. The reversal of 400034320040 is 40023430004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 334965452644 + 65068867396 = 578762^2 + 255086^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 400034319994 and 400034320021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21826775 + ... + 21845094.

Almost surely, 2^400034320040 is an apocalyptic number.

400034320040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400034320040 is an abundant number, since it is smaller than the sum of its proper divisors (503973388960).

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

400034320040 is a wasteful number, since it uses less digits than its factorization.

400034320040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43672109 (or 43672105 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

Adding to 400034320040 its reverse (40023430004), we get a palindrome (440057750044).

The spelling of 400034320040 in words is "four hundred billion, thirty-four million, three hundred twenty thousand, forty".