400042242 has 24 divisors (see below), whose sum is σ = 871303680. Its totient is φ = 132648120.

The previous prime is 400042241. The next prime is 400042309. The reversal of 400042242 is 242240004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (400042241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54742 + ... + 61617.

It is an arithmetic number, because the mean of its divisors is an integer number (36304320).

Almost surely, 2^400042242 is an apocalyptic number.

400042242 is an abundant number, since it is smaller than the sum of its proper divisors (471261438).

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

400042242 is a wasteful number, since it uses less digits than its factorization.

400042242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116558 (or 116555 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 400042242 is about 20001.0560221204. The cubic root of 400042242 is about 736.8322356249.

Adding to 400042242 its reverse (242240004), we get a palindrome (642282246).

The spelling of 400042242 in words is "four hundred million, forty-two thousand, two hundred forty-two".