400242404440 has 32 divisors (see below), whose sum is σ = 917536837680. Its totient is φ = 157076263552.

The previous prime is 400242404431. The next prime is 400242404447. The reversal of 400242404440 is 44404242004.

It is a junction number, because it is equal to n+sod(n) for n = 400242404399 and 400242404408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400242404447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94394674 + ... + 94398913.

Almost surely, 2^400242404440 is an apocalyptic number.

400242404440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400242404440 is an abundant number, since it is smaller than the sum of its proper divisors (517294433240).

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

400242404440 is a wasteful number, since it uses less digits than its factorization.

400242404440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188793651 (or 188793647 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 400242404440 its reverse (44404242004), we get a palindrome (444646646444).

The spelling of 400242404440 in words is "four hundred billion, two hundred forty-two million, four hundred four thousand, four hundred forty".