400040404242 has 128 divisors (see below), whose sum is σ = 912125491200. Its totient is φ = 116282428416.

The previous prime is 400040404217. The next prime is 400040404249. The reversal of 400040404242 is 242404040004.

It is a super-2 number, since 2×400040404242² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400040404249) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23335098 + ... + 23352234.

It is an arithmetic number, because the mean of its divisors is an integer number (7125980400).

Almost surely, 2^400040404242 is an apocalyptic number.

400040404242 is an abundant number, since it is smaller than the sum of its proper divisors (512085086958).

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

400040404242 is a wasteful number, since it uses less digits than its factorization.

400040404242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17520.

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 400040404242 its reverse (242404040004), we get a palindrome (642444444246).

The spelling of 400040404242 in words is "four hundred billion, forty million, four hundred four thousand, two hundred forty-two".