400342340242 has 16 divisors (see below), whose sum is σ = 684748437912. Its totient is φ = 173904364800.

The previous prime is 400342340239. The next prime is 400342340267. The reversal of 400342340242 is 242043243004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 246451680721 + 153890659521 = 496439^2 + 392289^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400342340242.

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, 452875509 + ... + 452876392.

Almost surely, 2^400342340242 is an apocalyptic number.

400342340242 is a deficient number, since it is larger than the sum of its proper divisors (284406097670).

400342340242 is a wasteful number, since it uses less digits than its factorization.

400342340242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905751933.

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 400342340242 its reverse (242043243004), we get a palindrome (642385583246).

The spelling of 400342340242 in words is "four hundred billion, three hundred forty-two million, three hundred forty thousand, two hundred forty-two".