15420222 has 24 divisors (see below), whose sum is σ = 33484464. Its totient is φ = 5128704.

The previous prime is 15420221. The next prime is 15420253. The reversal of 15420222 is 22202451.

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 = 15420195 and 15420204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12798 + ... + 13950.

It is an arithmetic number, because the mean of its divisors is an integer number (1395186).

Almost surely, 2^15420222 is an apocalyptic number.

15420222 is an abundant number, since it is smaller than the sum of its proper divisors (18064242).

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

15420222 is a wasteful number, since it uses less digits than its factorization.

15420222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904 (or 1901 counting only the distinct ones).

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

The square root of 15420222 is about 3926.8590501825. The cubic root of 15420222 is about 248.9030444607.

Adding to 15420222 its reverse (22202451), we get a palindrome (37622673).

The spelling of 15420222 in words is "fifteen million, four hundred twenty thousand, two hundred twenty-two".