7142220 has 36 divisors (see below), whose sum is σ = 21665280. Its totient is φ = 1904544.

The previous prime is 7142209. The next prime is 7142263. The reversal of 7142220 is 222417.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×7142220² = 102022613056800, which contains 22 as substring.

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 = 7142193 and 7142202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19660 + ... + 20019.

Almost surely, 2^7142220 is an apocalyptic number.

It is an amenable number.

7142220 is an abundant number, since it is smaller than the sum of its proper divisors (14523060).

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

7142220 is a wasteful number, since it uses less digits than its factorization.

7142220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39694 (or 39689 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 7142220 is about 2672.4932179521. The cubic root of 7142220 is about 192.5799521710.

Adding to 7142220 its reverse (222417), we get a palindrome (7364637).

The spelling of 7142220 in words is "seven million, one hundred forty-two thousand, two hundred twenty".