400005442 has 8 divisors (see below), whose sum is σ = 631587600. Its totient is φ = 189476244.

The previous prime is 400005407. The next prime is 400005449. The reversal of 400005442 is 244500004.

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

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (400005449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5263192 + ... + 5263267.

It is an arithmetic number, because the mean of its divisors is an integer number (78948450).

Almost surely, 2^400005442 is an apocalyptic number.

400005442 is a deficient number, since it is larger than the sum of its proper divisors (231582158).

400005442 is a wasteful number, since it uses less digits than its factorization.

400005442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10526480.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 400005442 is about 20000.1360495373. The cubic root of 400005442 is about 736.8096411295.

Adding to 400005442 its reverse (244500004), we get a palindrome (644505446).

The spelling of 400005442 in words is "four hundred million, five thousand, four hundred forty-two".