400016940 has 24 divisors (see below), whose sum is σ = 1120047600. Its totient is φ = 106671168.

The previous prime is 400016927. The next prime is 400016941. The reversal of 400016940 is 49610004.

It is a self number, because there is not a number n which added to its sum of digits gives 400016940.

It is not an unprimeable number, because it can be changed into a prime (400016941) 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 7 ways as a sum of consecutive naturals, for example, 3333415 + ... + 3333534.

It is an arithmetic number, because the mean of its divisors is an integer number (46668650).

Almost surely, 2^400016940 is an apocalyptic number.

It is an amenable number.

400016940 is an abundant number, since it is smaller than the sum of its proper divisors (720030660).

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

400016940 is a wasteful number, since it uses less digits than its factorization.

400016940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6666961 (or 6666959 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 400016940 is about 20000.4234955163. The cubic root of 400016940 is about 736.8167008302.

Adding to 400016940 its reverse (49610004), we get a palindrome (449626944).

The spelling of 400016940 in words is "four hundred million, sixteen thousand, nine hundred forty".