222401520 has 120 divisors (see below), whose sum is σ = 814827312. Its totient is φ = 53913600.

The previous prime is 222401453. The next prime is 222401527. The reversal of 222401520 is 25104222.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 222401493 and 222401502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222401527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6121 + ... + 21960.

Almost surely, 2^222401520 is an apocalyptic number.

222401520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222401520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (407413656).

222401520 is an abundant number, since it is smaller than the sum of its proper divisors (592425792).

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

222401520 is a wasteful number, since it uses less digits than its factorization.

222401520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28111 (or 28102 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 222401520 is about 14913.1324677279. The cubic root of 222401520 is about 605.8697233270.

Adding to 222401520 its reverse (25104222), we get a palindrome (247505742).

The spelling of 222401520 in words is "two hundred twenty-two million, four hundred one thousand, five hundred twenty".