400222240 has 48 divisors (see below), whose sum is σ = 1031486400. Its totient is φ = 145534720.

The previous prime is 400222189. The next prime is 400222247. The reversal of 400222240 is 42222004.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (400222247) 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, 111940 + ... + 115459.

It is an arithmetic number, because the mean of its divisors is an integer number (21489300).

Almost surely, 2^400222240 is an apocalyptic number.

400222240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400222240 is an abundant number, since it is smaller than the sum of its proper divisors (631264160).

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

400222240 is a wasteful number, since it uses less digits than its factorization.

400222240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227425 (or 227417 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 400222240 is about 20005.5552284859. Note that the first 3 decimals coincide. The cubic root of 400222240 is about 736.9427309908.

Adding to 400222240 its reverse (42222004), we get a palindrome (442444244).

The spelling of 400222240 in words is "four hundred million, two hundred twenty-two thousand, two hundred forty".