400340442 has 8 divisors (see below), whose sum is σ = 800680896. Its totient is φ = 133446812.

The previous prime is 400340401. The next prime is 400340443. The reversal of 400340442 is 244043004.

It is a sphenic number, since it is the product of 3 distinct primes.

400340442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (400340443) 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 3 ways as a sum of consecutive naturals, for example, 33361698 + ... + 33361709.

It is an arithmetic number, because the mean of its divisors is an integer number (100085112).

Almost surely, 2^400340442 is an apocalyptic number.

400340442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

400340442 is a wasteful number, since it uses less digits than its factorization.

400340442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66723412.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 400340442 is about 20008.5092398209. The cubic root of 400340442 is about 737.0152736283.

Adding to 400340442 its reverse (244043004), we get a palindrome (644383446).

The spelling of 400340442 in words is "four hundred million, three hundred forty thousand, four hundred forty-two".