222406440 has 32 divisors (see below), whose sum is σ = 667219680. Its totient is φ = 59308352.

The previous prime is 222406439. The next prime is 222406441. The reversal of 222406440 is 44604222.

It is an interprime number because it is at equal distance from previous prime (222406439) and next prime (222406441).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 222406440.

It is not an unprimeable number, because it can be changed into a prime (222406441) 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, 926574 + ... + 926813.

It is an arithmetic number, because the mean of its divisors is an integer number (20850615).

Almost surely, 2^222406440 is an apocalyptic number.

222406440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222406440 is an abundant number, since it is smaller than the sum of its proper divisors (444813240).

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

222406440 is a wasteful number, since it uses less digits than its factorization.

222406440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853401 (or 1853397 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 222406440 is about 14913.2974220995. The cubic root of 222406440 is about 605.8741910078.

It can be divided in two parts, 22240 and 6440, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 222406440 in words is "two hundred twenty-two million, four hundred six thousand, four hundred forty".